diff --git a/src/components/left/ArchivedChats.tsx b/src/components/left/ArchivedChats.tsx
index a774f70a7..098b867d5 100644
--- a/src/components/left/ArchivedChats.tsx
+++ b/src/components/left/ArchivedChats.tsx
@@ -68,7 +68,7 @@ const ArchivedChats: FC<OwnProps> = ({
         </Button>
         {shouldRenderTitle && <h3 className={titleClassNames}>{lang('ArchivedChats')}</h3>}
       </div>
-      <ChatList folderType="archived" isActive={isActive} />
+      <ChatList folderType="archived" isActive={isActive} isForumPanelOpen={isForumPanelOpen} />
       {shouldRenderForumPanel && (
         <ForumPanel
           isOpen={isForumPanelOpen}
diff --git a/src/components/left/main/AvatarBadge.tsx b/src/components/left/main/AvatarBadge.tsx
new file mode 100644
index 000000000..eee547322
--- /dev/null
+++ b/src/components/left/main/AvatarBadge.tsx
@@ -0,0 +1,52 @@
+import type { FC } from '../../../lib/teact/teact';
+import React, { memo } from '../../../lib/teact/teact';
+import { withGlobal } from '../../../global';
+
+import type { ApiChat } from '../../../api/types';
+
+import { selectIsChatMuted } from '../../../global/helpers';
+import {
+  selectChat,
+  selectNotifySettings,
+  selectNotifyExceptions,
+  selectIsForumPanelOpen,
+} from '../../../global/selectors';
+
+import Badge from './Badge';
+
+type OwnProps = {
+  chatId: string;
+};
+
+type StateProps = {
+  chat?: ApiChat;
+  isMuted?: boolean;
+  isForumPanelActive?: boolean;
+};
+
+const AvatarBadge: FC<OwnProps & StateProps> = ({
+  chat,
+  isMuted,
+  isForumPanelActive,
+}) => {
+  return chat && (
+    <div className="avatar-badge-wrapper">
+      <Badge chat={chat} isMuted={isMuted} shouldShowOnlyMostImportant forceHidden={!isForumPanelActive} />
+    </div>
+  );
+};
+
+export default memo(withGlobal<OwnProps>(
+  (global, { chatId }): StateProps => {
+    const chat = selectChat(global, chatId);
+    if (!chat) {
+      return {};
+    }
+
+    return {
+      chat,
+      isMuted: selectIsChatMuted(chat, selectNotifySettings(global), selectNotifyExceptions(global)),
+      isForumPanelActive: selectIsForumPanelOpen(global),
+    };
+  },
+)(AvatarBadge));
diff --git a/src/components/left/main/Chat.scss b/src/components/left/main/Chat.scss
index 1a4d55dce..ddec3d4dd 100644
--- a/src/components/left/main/Chat.scss
+++ b/src/components/left/main/Chat.scss
@@ -15,12 +15,17 @@
 
   &.animate-opacity {
     will-change: opacity;
-    transition: opacity 250ms ease;
+    transition: opacity 0.2s ease-out;
   }
 
   &.animate-transform {
     will-change: transform;
-    transition: transform 250ms ease;
+    transition: transform 0.2s ease-out;
+  }
+
+  &.animate-collapse {
+    will-change: transform;
+    transition: transform var(--layer-transition);
   }
 
   &:hover,
@@ -29,7 +34,7 @@
       border-color: var(--color-chat-hover);
     }
 
-    .status-badge-wrapper {
+    .avatar-badge-wrapper {
       --outline-color: var(--color-chat-hover);
     }
 
@@ -38,6 +43,16 @@
     }
   }
 
+  // Super specific selector to override the same in `ListItem`
+  @media (min-width: 600px) {
+    &:not(.has-ripple):not(.is-static),
+    body.animation-level-0 & {
+      .ListItem-button:active {
+        --background-color: var(--color-chat-hover) !important;
+      }
+    }
+  }
+
   &:last-of-type {
     padding-bottom: 0.5rem;
   }
@@ -55,17 +70,17 @@
       }
     }
 
-    &.active-forum {
-      .status-badge-wrapper {
+    &.selected-forum {
+      .avatar-badge-wrapper {
         --outline-color: var(--color-chat-hover);
       }
     }
   }
 
   @media (min-width: 600px) {
-    &.active-forum.forum,
-    &.active-forum.forum:hover {
-      .status-badge-wrapper {
+    &.selected-forum.forum,
+    &.selected-forum.forum:hover {
+      .avatar-badge-wrapper {
         --outline-color: var(--color-chat-hover);
       }
     }
@@ -111,7 +126,6 @@
       }
 
       .Badge:not(.pinned) {
-        background: var(--color-white);
         color: var(--color-chat-active);
       }
 
@@ -120,35 +134,18 @@
         background: #FFFFFF33;
       }
 
-      .status-badge-wrapper-visible .Badge:not(.pinned).muted {
-        background: var(--color-chat-active-greyed);
+      .avatar-badge-wrapper .Badge:not(.pinned) {
         --outline-color: transparent;
       }
 
-      .status-badge-wrapper-visible .Badge:not(.pinned):not(.muted) {
-        --outline-color: transparent;
+      .avatar-badge-wrapper .Badge:not(.pinned).muted {
+        background: var(--color-gray);
       }
     }
   }
 
-  &.smaller .ListItem-button {
-    height: 4.5rem;
-  }
-
-  &.active-forum::before {
-    content: '';
-    position: absolute;
-    top: 50%;
-    left: -0.5rem;
-    width: 0.375rem;
-    height: 75%;
-    transform: translateY(-50%);
-
-    background: var(--color-primary);
-    z-index: 1;
-
-    border-start-end-radius: var(--border-radius-default);
-    border-end-end-radius: var(--border-radius-default);
+  &.selected-forum {
+    --background-color: var(--color-chat-hover) !important;
   }
 
   @media (max-width: 600px) {
@@ -169,7 +166,7 @@
     background: var(--background-color);
   }
 
-  .status-badge-wrapper {
+  .avatar-badge-wrapper {
     position: absolute;
     bottom: 0;
     right: 0.5rem;
@@ -182,12 +179,12 @@
     }
 
     .Badge-transition {
-      transition: opacity 250ms ease, transform 250ms ease; // Same as Forum Panel
+      transition: opacity var(--layer-transition), transform var(--layer-transition);
     }
   }
 
   .info {
-    transition: opacity 250ms ease, transform 250ms ease; // Same as Forum Panel
+    transition: opacity 300ms ease, transform var(--layer-transition);
 
     .subtitle {
       margin-top: -0.125rem;
@@ -316,19 +313,5 @@
         unicode-bidi: plaintext;
       }
     }
-
-    &.active-forum::before {
-      left: auto;
-      right: 0.0625rem;
-    }
-  }
-
-  &.smaller .info {
-    transform: translateX(-25%);
-    opacity: 0;
-  }
-
-  &[dir="rtl"].smaller .info {
-    transform: translateX(25%);
   }
 }
diff --git a/src/components/left/main/Chat.tsx b/src/components/left/main/Chat.tsx
index f4c354fe3..b212ac0e1 100644
--- a/src/components/left/main/Chat.tsx
+++ b/src/components/left/main/Chat.tsx
@@ -1,7 +1,5 @@
 import type { FC } from '../../../lib/teact/teact';
-import React, {
-  memo, useCallback, useEffect, useLayoutEffect, useRef,
-} from '../../../lib/teact/teact';
+import React, { memo, useCallback, useEffect } from '../../../lib/teact/teact';
 import { getActions, withGlobal } from '../../../global';
 
 import type { ObserveFn } from '../../../hooks/useIntersectionObserver';
@@ -18,7 +16,6 @@ import type {
 import type { AnimationLevel } from '../../../types';
 import type { ChatAnimationTypes } from './hooks';
 
-import { ANIMATION_END_DELAY } from '../../../config';
 import { MAIN_THREAD_ID } from '../../../api/types';
 import { IS_SINGLE_COLUMN_LAYOUT } from '../../../util/environment';
 import {
@@ -40,40 +37,35 @@ import {
   selectIsDefaultEmojiStatusPack,
   selectTopicFromMessage,
   selectThreadParam,
-  selectIsForumPanelOpen,
 } from '../../../global/selectors';
 import buildClassName from '../../../util/buildClassName';
-import { fastRaf } from '../../../util/schedulers';
-import buildStyle from '../../../util/buildStyle';
 
 import useChatContextActions from '../../../hooks/useChatContextActions';
 import useFlag from '../../../hooks/useFlag';
 import useChatListEntry from './hooks/useChatListEntry';
 import { useIsIntersecting } from '../../../hooks/useIntersectionObserver';
-import usePrevious from '../../../hooks/usePrevious';
 
+import ListItem from '../../ui/ListItem';
 import Avatar from '../../common/Avatar';
 import LastMessageMeta from '../../common/LastMessageMeta';
 import DeleteChatModal from '../../common/DeleteChatModal';
-import ListItem from '../../ui/ListItem';
-import Badge from './Badge';
-import ChatFolderModal from '../ChatFolderModal.async';
-import ChatCallStatus from './ChatCallStatus';
 import ReportModal from '../../common/ReportModal';
 import FullNameTitle from '../../common/FullNameTitle';
+import ChatFolderModal from '../ChatFolderModal.async';
+import ChatCallStatus from './ChatCallStatus';
+import Badge from './Badge';
+import AvatarBadge from './AvatarBadge';
 
 import './Chat.scss';
 
-const TRANSFORM_TO_TOPIC_LIST_ANIMATION_DELAY = 300;
-
 type OwnProps = {
   chatId: string;
   folderId?: number;
   orderDiff: number;
   animationType: ChatAnimationTypes;
   isPinned?: boolean;
-  offsetTopInSmallerMode: number;
   offsetTop: number;
+  offsetCollapseDelta: number;
   observeIntersection?: ObserveFn;
   onDragEnter?: (chatId: string) => void;
 };
@@ -92,13 +84,12 @@ type StateProps = {
   draft?: ApiFormattedText;
   animationLevel?: AnimationLevel;
   isSelected?: boolean;
-  isForumPanelActive?: boolean;
+  isSelectedForum?: boolean;
   canScrollDown?: boolean;
   canChangeFolder?: boolean;
   lastSyncTime?: number;
   lastMessageTopic?: ApiTopic;
   typingStatus?: ApiTypingStatus;
-  forumPanelChatId?: string;
 };
 
 const Chat: FC<OwnProps & StateProps> = ({
@@ -118,24 +109,22 @@ const Chat: FC<OwnProps & StateProps> = ({
   lastMessageOutgoingStatus,
   actionTargetMessage,
   actionTargetChatId,
-  offsetTopInSmallerMode,
   offsetTop,
+  offsetCollapseDelta,
   draft,
   animationLevel,
   isSelected,
-  isForumPanelActive,
+  isSelectedForum,
   canScrollDown,
   canChangeFolder,
   lastSyncTime,
   lastMessageTopic,
   typingStatus,
-  forumPanelChatId,
   onDragEnter,
 }) => {
   const {
     openChat,
     openForumPanel,
-    closeForumPanel,
     focusLastMessage,
     loadTopics,
   } = getActions();
@@ -161,27 +150,24 @@ const Chat: FC<OwnProps & StateProps> = ({
     lastMessageTopic,
     lastMessageSender,
     observeIntersection,
-
     animationType,
     animationLevel,
     orderDiff,
   });
 
   const handleClick = useCallback(() => {
-    if (chat?.isForum) {
+    if (isForum) {
       openForumPanel({ chatId });
       return;
     }
 
-    if (forumPanelChatId) closeForumPanel();
     openChat({ id: chatId, shouldReplaceHistory: true }, { forceOnHeavyAnimation: true });
 
     if (isSelected && canScrollDown) {
       focusLastMessage();
     }
   }, [
-    chat?.isForum, forumPanelChatId, closeForumPanel, openChat, chatId, isSelected, canScrollDown, openForumPanel,
-    focusLastMessage,
+    isForum, openChat, chatId, isSelected, canScrollDown, openForumPanel, focusLastMessage,
   ]);
 
   const handleDragEnter = useCallback((e) => {
@@ -225,31 +211,6 @@ const Chat: FC<OwnProps & StateProps> = ({
     }
   }, [chat, chatId, isForum, isIntersecting, lastSyncTime, loadTopics]);
 
-  const isOnForumPanel = chatId === forumPanelChatId;
-  const prevIsForumPanelActive = usePrevious(isForumPanelActive);
-  const isAnimatingRef = useRef(false);
-
-  if (prevIsForumPanelActive !== isForumPanelActive) {
-    isAnimatingRef.current = true;
-  }
-
-  // Animate changing to smaller chat size when navigating to/from forum topic list
-  useLayoutEffect(() => {
-    const current = ref.current;
-
-    if (current && isAnimatingRef.current && isForumPanelActive !== prevIsForumPanelActive) {
-      current.classList.add('animate-transform');
-      current.style.transform = '';
-      setTimeout(() => {
-        // Wait one more frame for better animation performance
-        fastRaf(() => {
-          isAnimatingRef.current = false;
-          current.classList.remove('animate-transform');
-        });
-      }, TRANSFORM_TO_TOPIC_LIST_ANIMATION_DELAY + ANIMATION_END_DELAY);
-    }
-  }, [ref, isForumPanelActive, prevIsForumPanelActive]);
-
   if (!chat) {
     return undefined;
   }
@@ -259,23 +220,20 @@ const Chat: FC<OwnProps & StateProps> = ({
     isUserId(chatId) ? 'private' : 'group',
     isForum && 'forum',
     isSelected && 'selected',
-    isForumPanelActive && 'smaller',
-    isOnForumPanel && 'active-forum',
+    isSelectedForum && 'selected-forum',
   );
 
-  const chatTop = isForumPanelActive ? (offsetTop - offsetTopInSmallerMode) : offsetTop;
-  const offsetAnimate = isForumPanelActive ? offsetTopInSmallerMode : -offsetTopInSmallerMode;
-
   return (
     <ListItem
       ref={ref}
       className={className}
-      style={buildStyle(`top: ${chatTop}px`, isAnimatingRef.current && `transform: translateY(${offsetAnimate}px)`)}
+      style={`top: ${offsetTop}px`}
       ripple={!isForum && !IS_SINGLE_COLUMN_LAYOUT}
       contextActions={contextActions}
       onClick={handleClick}
       onDragEnter={handleDragEnter}
-      shouldUsePortalForMenu={isForumPanelActive}
+      offsetCollapseDelta={offsetCollapseDelta}
+      withPortalForMenu
     >
       <div className="status">
         <Avatar
@@ -288,9 +246,7 @@ const Chat: FC<OwnProps & StateProps> = ({
           withVideo
           observeIntersection={observeIntersection}
         />
-        <div className="status-badge-wrapper">
-          <Badge chat={chat} isMuted={isMuted} shouldShowOnlyMostImportant forceHidden={!isForumPanelActive} />
-        </div>
+        <AvatarBadge chatId={chatId} />
         {chat.isCallActive && chat.isCallNotEmpty && (
           <ChatCallStatus isSelected={isSelected} isActive={animationLevel !== 0} />
         )}
@@ -368,8 +324,8 @@ export default memo(withGlobal<OwnProps>(
       threadId: currentThreadId,
       type: messageListType,
     } = selectCurrentMessageList(global) || {};
-    const isForumPanelActive = selectIsForumPanelOpen(global);
     const isSelected = chatId === currentChatId && currentThreadId === MAIN_THREAD_ID;
+    const isSelectedForum = chatId === global.forumPanelChatId;
 
     const user = privateChatUserId ? selectUser(global, privateChatUserId) : undefined;
     const userStatus = privateChatUserId ? selectUserStatus(global, privateChatUserId) : undefined;
@@ -388,8 +344,8 @@ export default memo(withGlobal<OwnProps>(
       actionTargetMessage,
       draft: selectDraft(global, chatId, MAIN_THREAD_ID),
       animationLevel: global.settings.byKey.animationLevel,
-      isForumPanelActive,
       isSelected,
+      isSelectedForum,
       canScrollDown: isSelected && messageListType === 'thread',
       canChangeFolder: (global.chatFolders.orderedIds?.length || 0) > 1,
       lastSyncTime: global.lastSyncTime,
@@ -401,7 +357,6 @@ export default memo(withGlobal<OwnProps>(
       isEmojiStatusColored,
       lastMessageTopic,
       typingStatus,
-      forumPanelChatId: global.forumPanelChatId,
     };
   },
 )(Chat));
diff --git a/src/components/left/main/ChatFolders.tsx b/src/components/left/main/ChatFolders.tsx
index 4448211a3..47ce074f8 100644
--- a/src/components/left/main/ChatFolders.tsx
+++ b/src/components/left/main/ChatFolders.tsx
@@ -22,6 +22,7 @@ import { useFolderManagerForUnreadCounters } from '../../../hooks/useFolderManag
 import Transition from '../../ui/Transition';
 import TabList from '../../ui/TabList';
 import ChatList from './ChatList';
+import { selectIsForumPanelOpen } from '../../../global/selectors';
 
 type OwnProps = {
   onScreenSelect: (screen: SettingsScreens) => void;
@@ -34,6 +35,7 @@ type StateProps = {
   orderedFolderIds?: number[];
   activeChatFolder: number;
   currentUserId?: string;
+  isForumPanelOpen?: boolean;
   lastSyncTime?: number;
   shouldSkipHistoryAnimations?: boolean;
   maxFolders: number;
@@ -49,6 +51,7 @@ const ChatFolders: FC<OwnProps & StateProps> = ({
   orderedFolderIds,
   activeChatFolder,
   currentUserId,
+  isForumPanelOpen,
   lastSyncTime,
   shouldSkipHistoryAnimations,
   maxFolders,
@@ -195,27 +198,17 @@ const ChatFolders: FC<OwnProps & StateProps> = ({
   function renderCurrentTab(isActive: boolean) {
     const activeFolder = Object.values(chatFoldersById)
       .find(({ id }) => id === folderTabs![activeChatFolder].id);
-
-    if (!activeFolder || isInAllChatsFolder) {
-      return (
-        <ChatList
-          folderType="all"
-          isActive={isActive}
-          lastSyncTime={lastSyncTime}
-          foldersDispatch={foldersDispatch}
-          onScreenSelect={onScreenSelect}
-        />
-      );
-    }
+    const isFolder = activeFolder && !isInAllChatsFolder;
 
     return (
       <ChatList
-        folderType="folder"
-        folderId={activeFolder.id}
+        folderType={isFolder ? 'folder' : 'all'}
+        folderId={isFolder ? activeFolder.id : undefined}
         isActive={isActive}
+        isForumPanelOpen={isForumPanelOpen}
         lastSyncTime={lastSyncTime}
-        onScreenSelect={onScreenSelect}
         foldersDispatch={foldersDispatch}
+        onScreenSelect={onScreenSelect}
       />
     );
   }
@@ -259,16 +252,15 @@ export default memo(withGlobal<OwnProps>(
       shouldSkipHistoryAnimations,
     } = global;
 
-    const maxFolders = selectCurrentLimit(global, 'dialogFilters');
-
     return {
       chatFoldersById,
       orderedFolderIds,
       activeChatFolder,
       currentUserId,
+      isForumPanelOpen: selectIsForumPanelOpen(global),
       lastSyncTime,
       shouldSkipHistoryAnimations,
-      maxFolders,
+      maxFolders: selectCurrentLimit(global, 'dialogFilters'),
     };
   },
 )(ChatFolders));
diff --git a/src/components/left/main/ChatList.tsx b/src/components/left/main/ChatList.tsx
index e5740649e..cf5e0164b 100644
--- a/src/components/left/main/ChatList.tsx
+++ b/src/components/left/main/ChatList.tsx
@@ -16,6 +16,7 @@ import {
 import { IS_MAC_OS, IS_PWA } from '../../../util/environment';
 import { getPinnedChatsCount, getOrderKey } from '../../../util/folderManager';
 import { selectChat } from '../../../global/selectors';
+import buildClassName from '../../../util/buildClassName';
 
 import useInfiniteScroll from '../../../hooks/useInfiniteScroll';
 import { useFolderManagerForOrderedIds } from '../../../hooks/useFolderManager';
@@ -28,11 +29,13 @@ import InfiniteScroll from '../../ui/InfiniteScroll';
 import Loading from '../../ui/Loading';
 import Chat from './Chat';
 import EmptyFolder from './EmptyFolder';
+import useCollapseWithForumPanel from './hooks/useCollapseWithForumPanel';
 
 type OwnProps = {
   folderType: 'all' | 'archived' | 'folder';
   folderId?: number;
   isActive: boolean;
+  isForumPanelOpen?: boolean;
   lastSyncTime?: number;
   foldersDispatch?: FolderEditDispatch;
   onScreenSelect?: (screen: SettingsScreens) => void;
@@ -45,6 +48,7 @@ const ChatList: FC<OwnProps> = ({
   folderType,
   folderId,
   isActive,
+  isForumPanelOpen,
   foldersDispatch,
   onScreenSelect,
 }) => {
@@ -105,6 +109,8 @@ const ChatList: FC<OwnProps> = ({
     throttleMs: INTERSECTION_THROTTLE,
   });
 
+  useCollapseWithForumPanel(containerRef, isForumPanelOpen);
+
   const handleDragEnter = useDebouncedCallback((chatId: string) => {
     if (shouldIgnoreDragRef.current) {
       shouldIgnoreDragRef.current = false;
@@ -143,8 +149,9 @@ const ChatList: FC<OwnProps> = ({
 
     return viewportIds!.map((id, i) => {
       const isPinned = viewportOffset + i < pinnedCount;
-      const chatTop = currentChatListHeight;
-      const chatTopSmaller = (viewportOffset + i) * CHAT_HEIGHT_PX;
+      const expendedOffsetTop = currentChatListHeight;
+      const collapsedOffsetTop = (viewportOffset + i) * CHAT_HEIGHT_PX;
+
       currentChatListHeight += (selectChat(global, id)!.isForum ? CHAT_HEIGHT_FORUM_PX : CHAT_HEIGHT_PX);
 
       return (
@@ -156,8 +163,8 @@ const ChatList: FC<OwnProps> = ({
           folderId={folderId}
           animationType={getAnimationType(id)}
           orderDiff={orderDiffById[id]}
-          offsetTop={chatTop}
-          offsetTopInSmallerMode={chatTop - chatTopSmaller}
+          offsetTop={isForumPanelOpen ? collapsedOffsetTop : expendedOffsetTop}
+          offsetCollapseDelta={expendedOffsetTop - collapsedOffsetTop}
           observeIntersection={observe}
           onDragEnter={handleDragEnter}
         />
@@ -167,7 +174,7 @@ const ChatList: FC<OwnProps> = ({
 
   return (
     <InfiniteScroll
-      className="chat-list custom-scroll"
+      className={buildClassName('chat-list custom-scroll', isForumPanelOpen && 'forum-panel-open')}
       ref={containerRef}
       items={viewportIds}
       preloadBackwards={CHAT_LIST_SLICE}
diff --git a/src/components/left/main/ForumPanel.module.scss b/src/components/left/main/ForumPanel.module.scss
index 5ebf02b07..fa9316f7e 100644
--- a/src/components/left/main/ForumPanel.module.scss
+++ b/src/components/left/main/ForumPanel.module.scss
@@ -10,6 +10,10 @@
   display: flex;
   flex-direction: column;
 
+  @media (max-width: 600px) {
+    left: 4.3125rem;
+  }
+
   &.rtl {
     left: 0;
     right: 4.75rem;
@@ -18,7 +22,7 @@
     border-right: 1px solid var(--color-borders);
   }
 
-  transition: transform 250ms ease; // Same as `.Chat > .info`
+  transition: transform var(--layer-transition);
   transform: translate3d(100%, 0, 0);
 
   :global(.chat-list) {
diff --git a/src/components/left/main/LeftMain.scss b/src/components/left/main/LeftMain.scss
index aec3eaf65..28bc67ab4 100644
--- a/src/components/left/main/LeftMain.scss
+++ b/src/components/left/main/LeftMain.scss
@@ -35,7 +35,7 @@
       z-index: 1;
 
       opacity: 1;
-      transition: opacity 250ms ease; // Same as Forum Panel
+      transition: opacity var(--layer-transition);
     }
 
     &--tabs-hidden .TabList {
diff --git a/src/components/left/main/LeftMainHeader.scss b/src/components/left/main/LeftMainHeader.scss
index 625a54f31..9c8cee259 100644
--- a/src/components/left/main/LeftMainHeader.scss
+++ b/src/components/left/main/LeftMainHeader.scss
@@ -102,7 +102,7 @@
   }
 
   .SearchInput {
-    transition: opacity 250ms ease; // Same as Forum Panel
+    transition: opacity var(--layer-transition);
 
     &--hidden {
       opacity: 0;
diff --git a/src/components/left/main/hooks/useCollapseWithForumPanel.ts b/src/components/left/main/hooks/useCollapseWithForumPanel.ts
new file mode 100644
index 000000000..aec2c57ad
--- /dev/null
+++ b/src/components/left/main/hooks/useCollapseWithForumPanel.ts
@@ -0,0 +1,36 @@
+import { useLayoutEffect } from '../../../../lib/teact/teact';
+import { fastRaf } from '../../../../util/schedulers';
+import { ANIMATION_END_DELAY } from '../../../../config';
+
+const ANIMATION_DURATION = 450;
+
+// Reduce height of forum chat items when opening Forum Panel
+export default function useCollapseWithForumPanel(
+  containerRef: React.RefObject<HTMLDivElement>,
+  isForumPanelOpen = false,
+) {
+  useLayoutEffect(() => {
+    const chatEls = Array.from(containerRef.current!.querySelectorAll<HTMLDivElement>('.Chat'));
+
+    chatEls.forEach((chatEl) => {
+      const offsetCollapseDelta = Number(chatEl.dataset.offsetCollapseDelta);
+      chatEl.style.transform = `translateY(${isForumPanelOpen ? offsetCollapseDelta : -offsetCollapseDelta!}px)`;
+    });
+
+    fastRaf(() => {
+      chatEls.forEach((chatEl) => {
+        chatEl.classList.add('animate-collapse');
+        chatEl.style.transform = '';
+      });
+    });
+
+    setTimeout(() => {
+      // Wait one more frame for better animation performance
+      fastRaf(() => {
+        chatEls.forEach((chatEl) => {
+          chatEl.classList.remove('animate-collapse');
+        });
+      });
+    }, ANIMATION_DURATION + ANIMATION_END_DELAY);
+  }, [containerRef, isForumPanelOpen]);
+}
diff --git a/src/components/ui/ListItem.scss b/src/components/ui/ListItem.scss
index 67f6c4759..a2b90883c 100644
--- a/src/components/ui/ListItem.scss
+++ b/src/components/ui/ListItem.scss
@@ -94,7 +94,6 @@
       }
 
       @media (hover: hover) {
-
         &:hover,
         &:focus {
           --background-color: var(--color-chat-hover);
diff --git a/src/components/ui/ListItem.tsx b/src/components/ui/ListItem.tsx
index 9b200559a..9577d7efc 100644
--- a/src/components/ui/ListItem.tsx
+++ b/src/components/ui/ListItem.tsx
@@ -44,13 +44,14 @@ interface OwnProps {
   destructive?: boolean;
   multiline?: boolean;
   isStatic?: boolean;
-  clickArg?: any;
   contextActions?: MenuItemContextAction[];
+  offsetCollapseDelta?: number;
+  withPortalForMenu?: boolean;
   onMouseDown?: (e: React.MouseEvent<HTMLDivElement>) => void;
   onClick?: (e: React.MouseEvent<HTMLDivElement>, arg?: any) => void;
+  clickArg?: any;
   onSecondaryIconClick?: (e: React.MouseEvent<HTMLButtonElement>) => void;
   onDragEnter?: (e: React.DragEvent<HTMLDivElement>) => void;
-  shouldUsePortalForMenu?: boolean;
 }
 
 const ListItem: FC<OwnProps> = ({
@@ -74,12 +75,13 @@ const ListItem: FC<OwnProps> = ({
   multiline,
   isStatic,
   contextActions,
+  withPortalForMenu,
+  offsetCollapseDelta,
   onMouseDown,
   onClick,
   clickArg,
   onSecondaryIconClick,
   onDragEnter,
-  shouldUsePortalForMenu,
 }) => {
   // eslint-disable-next-line no-null/no-null
   let containerRef = useRef<HTMLDivElement>(null);
@@ -107,8 +109,8 @@ const ListItem: FC<OwnProps> = ({
   );
 
   const getLayout = useCallback(
-    () => ({ shouldUsePortalPositioning: shouldUsePortalForMenu }),
-    [shouldUsePortalForMenu],
+    () => ({ withPortal: withPortalForMenu }),
+    [withPortalForMenu],
   );
 
   const {
@@ -183,6 +185,7 @@ const ListItem: FC<OwnProps> = ({
       className={fullClassName}
       dir={lang.isRtl ? 'rtl' : undefined}
       style={style}
+      data-offset-collapse-delta={offsetCollapseDelta}
       onMouseDown={onMouseDown}
       onDragEnter={onDragEnter}
     >
@@ -230,7 +233,7 @@ const ListItem: FC<OwnProps> = ({
           autoClose
           onClose={handleContextMenuClose}
           onCloseAnimationEnd={handleContextMenuHide}
-          shouldUsePortalForMenu={shouldUsePortalForMenu}
+          withPortal={withPortalForMenu}
         >
           {contextActions.map((action) => (
             <MenuItem
diff --git a/src/components/ui/Menu.tsx b/src/components/ui/Menu.tsx
index 93ea20bb7..b5ef1639e 100644
--- a/src/components/ui/Menu.tsx
+++ b/src/components/ui/Menu.tsx
@@ -41,7 +41,7 @@ type OwnProps = {
   onClose: () => void;
   onMouseEnter?: (e: React.MouseEvent<HTMLDivElement, MouseEvent>) => void;
   onMouseLeave?: (e: React.MouseEvent<HTMLDivElement, MouseEvent>) => void;
-  shouldUsePortalForMenu?: boolean;
+  withPortal?: boolean;
   children: React.ReactNode;
 };
 
@@ -70,7 +70,7 @@ const Menu: FC<OwnProps> = ({
   onMouseEnter,
   onMouseLeave,
   shouldSkipTransition,
-  shouldUsePortalForMenu,
+  withPortal,
 }) => {
   // eslint-disable-next-line no-null/no-null
   let menuRef = useRef<HTMLDivElement>(null);
@@ -161,7 +161,7 @@ const Menu: FC<OwnProps> = ({
     </div>
   );
 
-  if (shouldUsePortalForMenu) {
+  if (withPortal) {
     return <Portal>{menu}</Portal>;
   }
 
diff --git a/src/global/actions/ui/chats.ts b/src/global/actions/ui/chats.ts
index bb190ea83..91ebe75ef 100644
--- a/src/global/actions/ui/chats.ts
+++ b/src/global/actions/ui/chats.ts
@@ -54,6 +54,10 @@ addActionHandler('openChat', (global, actions, payload) => {
     };
   }
 
+  if (id !== global.forumPanelChatId) {
+    actions.closeForumPanel();
+  }
+
   return updateCurrentMessageList(global, id, threadId, type, shouldReplaceHistory);
 });
 
diff --git a/src/hooks/useContextMenuPosition.ts b/src/hooks/useContextMenuPosition.ts
index e0e0a242f..19e8540ed 100644
--- a/src/hooks/useContextMenuPosition.ts
+++ b/src/hooks/useContextMenuPosition.ts
@@ -6,7 +6,7 @@ interface Layout {
   extraTopPadding?: number;
   marginSides?: number;
   extraMarginTop?: number;
-  shouldUsePortalPositioning?: boolean;
+  withPortal?: boolean;
 }
 
 const MENU_POSITION_VISUAL_COMFORT_SPACE_PX = 16;
@@ -48,7 +48,7 @@ export default function useContextMenuPosition(
       extraTopPadding = 0,
       marginSides = 0,
       extraMarginTop = 0,
-      shouldUsePortalPositioning = false,
+      withPortal = false,
     } = getLayout?.() || {};
 
     const marginTop = menuEl ? parseInt(getComputedStyle(menuEl).marginTop, 10) + extraMarginTop : undefined;
@@ -100,8 +100,8 @@ export default function useContextMenuPosition(
 
     const triggerRect = triggerEl.getBoundingClientRect();
 
-    const addedYForPortalPositioning = (shouldUsePortalPositioning ? triggerRect.top : 0);
-    const addedXForPortalPositioning = (shouldUsePortalPositioning ? triggerRect.left : 0);
+    const addedYForPortalPositioning = (withPortal ? triggerRect.top : 0);
+    const addedXForPortalPositioning = (withPortal ? triggerRect.left : 0);
 
     const left = (horizontalPosition === 'left'
       ? Math.max(MENU_POSITION_VISUAL_COMFORT_SPACE_PX, Math.min(
diff --git a/src/styles/_common.scss b/src/styles/_common.scss
index bbbce9978..06041b66a 100644
--- a/src/styles/_common.scss
+++ b/src/styles/_common.scss
@@ -88,6 +88,21 @@
     @include overflow-y-overlay();
   }
 
+  &.forum-panel-open {
+    .info {
+      transform: translateX(-25%);
+      opacity: 0;
+    }
+
+    .Chat[dir="rtl"] .info {
+      transform: translateX(25%);
+    }
+
+    .ListItem-button {
+      height: 4.5rem;
+    }
+  }
+
   .scroll-container {
     position: relative;
   }
diff --git a/src/styles/_variables.scss b/src/styles/_variables.scss
index 29afa5abf..6c122dc89 100644
--- a/src/styles/_variables.scss
+++ b/src/styles/_variables.scss
@@ -150,7 +150,6 @@ $color-message-reaction-own-hover: #b5e0a4;
 
   --color-chat-hover: #{$color-chat-hover};
   --color-chat-active: #{$color-chat-active};
-  --color-chat-active-greyed: #60a7f0;
   --color-item-active: #{$color-item-active};
 
   --color-selection-highlight: #{$color-selection};