diff --git a/packages/editor/src/components/collab-sidebar/constants.js b/packages/editor/src/components/collab-sidebar/constants.js
index 748c2afc26374d..b62e30c346e1f9 100644
--- a/packages/editor/src/components/collab-sidebar/constants.js
+++ b/packages/editor/src/components/collab-sidebar/constants.js
@@ -1 +1,2 @@
+export const collabHistorySidebarName = 'edit-post/collab-history-sidebar';
 export const collabSidebarName = 'edit-post/collab-sidebar';
diff --git a/packages/editor/src/components/collab-sidebar/index.js b/packages/editor/src/components/collab-sidebar/index.js
index 17a23a227424a6..0fe46c549cff0f 100644
--- a/packages/editor/src/components/collab-sidebar/index.js
+++ b/packages/editor/src/components/collab-sidebar/index.js
@@ -2,7 +2,12 @@
  * WordPress dependencies
  */
 import { __ } from '@wordpress/i18n';
-import { useSelect, useDispatch, resolveSelect } from '@wordpress/data';
+import {
+	useSelect,
+	useDispatch,
+	resolveSelect,
+	subscribe,
+} from '@wordpress/data';
 import { useState, useMemo } from '@wordpress/element';
 import { comment as commentIcon } from '@wordpress/icons';
 import { addFilter } from '@wordpress/hooks';
@@ -15,12 +20,13 @@ import { store as interfaceStore } from '@wordpress/interface';
  * Internal dependencies
  */
 import PluginSidebar from '../plugin-sidebar';
-import { collabSidebarName } from './constants';
+import { collabHistorySidebarName, collabSidebarName } from './constants';
 import { Comments } from './comments';
 import { AddComment } from './add-comment';
 import { store as editorStore } from '../../store';
 import AddCommentButton from './comment-button';
 import AddCommentToolbarButton from './comment-button-toolbar';
+import { useGlobalStylesContext } from '../global-styles-provider';
 
 const isBlockCommentExperimentEnabled =
 	window?.__experimentalEnableBlockComment;
@@ -44,61 +50,28 @@ addFilter(
 	modifyBlockCommentAttributes
 );
 
-function CollabSidebarContent( { showCommentBoard, setShowCommentBoard } ) {
+function CollabSidebarContent( {
+	showCommentBoard,
+	setShowCommentBoard,
+	styles,
+	comments,
+} ) {
 	const { createNotice } = useDispatch( noticesStore );
 	const { saveEntityRecord, deleteEntityRecord } = useDispatch( coreStore );
 	const { getEntityRecord } = resolveSelect( coreStore );
 
-	const { postId, threads } = useSelect( ( select ) => {
+	const { postId } = useSelect( ( select ) => {
 		const { getCurrentPostId } = select( editorStore );
 		const _postId = getCurrentPostId();
-		const data = !! _postId
-			? select( coreStore ).getEntityRecords( 'root', 'comment', {
-					post: _postId,
-					type: 'block_comment',
-					status: 'any',
-					per_page: 100,
-			  } )
-			: null;
 
 		return {
 			postId: _postId,
-			threads: data,
 		};
 	}, [] );
 
 	const { getSelectedBlockClientId } = useSelect( blockEditorStore );
 	const { updateBlockAttributes } = useDispatch( blockEditorStore );
 
-	// Process comments to build the tree structure
-	const resultComments = useMemo( () => {
-		// Create a compare to store the references to all objects by id
-		const compare = {};
-		const result = [];
-
-		const filteredComments = ( threads ?? [] ).filter(
-			( comment ) => comment.status !== 'trash'
-		);
-
-		// Initialize each object with an empty `reply` array
-		filteredComments.forEach( ( item ) => {
-			compare[ item.id ] = { ...item, reply: [] };
-		} );
-
-		// Iterate over the data to build the tree structure
-		filteredComments.forEach( ( item ) => {
-			if ( item.parent === 0 ) {
-				// If parent is 0, it's a root item, push it to the result array
-				result.push( compare[ item.id ] );
-			} else if ( compare[ item.parent ] ) {
-				// Otherwise, find its parent and push it to the parent's `reply` array
-				compare[ item.parent ].reply.push( compare[ item.id ] );
-			}
-		} );
-
-		return result;
-	}, [ threads ] );
-
 	// Function to save the comment.
 	const addNewComment = async ( comment, parentCommentId ) => {
 		const args = {
@@ -222,14 +195,14 @@ function CollabSidebarContent( { showCommentBoard, setShowCommentBoard } ) {
 	};
 
 	return (
-		<div className="editor-collab-sidebar-panel">
+		<div className="editor-collab-sidebar-panel" style={ styles }>
 			<AddComment
 				onSubmit={ addNewComment }
 				showCommentBoard={ showCommentBoard }
 				setShowCommentBoard={ setShowCommentBoard }
 			/>
 			<Comments
-				threads={ resultComments }
+				threads={ comments }
 				onEditComment={ onEditComment }
 				onAddReply={ addNewComment }
 				onCommentDelete={ onCommentDelete }
@@ -245,6 +218,7 @@ function CollabSidebarContent( { showCommentBoard, setShowCommentBoard } ) {
 export default function CollabSidebar() {
 	const [ showCommentBoard, setShowCommentBoard ] = useState( false );
 	const { enableComplementaryArea } = useDispatch( interfaceStore );
+	const { getActiveComplementaryArea } = useSelect( interfaceStore );
 
 	const { postStatus } = useSelect( ( select ) => {
 		return {
@@ -270,6 +244,68 @@ export default function CollabSidebar() {
 		enableComplementaryArea( 'core', 'edit-post/collab-sidebar' );
 	};
 
+	const { threads } = useSelect( ( select ) => {
+		const { getCurrentPostId } = select( editorStore );
+		const _postId = getCurrentPostId();
+		const data = !! _postId
+			? select( coreStore ).getEntityRecords( 'root', 'comment', {
+					post: _postId,
+					type: 'block_comment',
+					status: 'any',
+					per_page: 100,
+			  } )
+			: null;
+
+		return {
+			postId: _postId,
+			threads: data,
+		};
+	}, [] );
+
+	// Process comments to build the tree structure
+	const resultComments = useMemo( () => {
+		// Create a compare to store the references to all objects by id
+		const compare = {};
+		const result = [];
+
+		const filteredComments = ( threads ?? [] ).filter(
+			( comment ) => comment.status !== 'trash'
+		);
+
+		// Initialize each object with an empty `reply` array
+		filteredComments.forEach( ( item ) => {
+			compare[ item.id ] = { ...item, reply: [] };
+		} );
+
+		// Iterate over the data to build the tree structure
+		filteredComments.forEach( ( item ) => {
+			if ( item.parent === 0 ) {
+				// If parent is 0, it's a root item, push it to the result array
+				result.push( compare[ item.id ] );
+			} else if ( compare[ item.parent ] ) {
+				// Otherwise, find its parent and push it to the parent's `reply` array
+				compare[ item.parent ].reply.push( compare[ item.id ] );
+			}
+		} );
+
+		return result;
+	}, [ threads ] );
+
+	// Get the global styles to set the background color of the sidebar.
+	const { merged: GlobalStyles } = useGlobalStylesContext();
+	const backgroundColor = GlobalStyles?.styles?.color?.background;
+
+	if ( 0 < resultComments.length ) {
+		const unsubscribe = subscribe( () => {
+			const activeSidebar = getActiveComplementaryArea( 'core' );
+
+			if ( ! activeSidebar ) {
+				enableComplementaryArea( 'core', collabSidebarName );
+				unsubscribe();
+			}
+		} );
+	}
+
 	// Check if the experimental flag is enabled.
 	if ( ! isBlockCommentExperimentEnabled || postStatus === 'publish' ) {
 		return null; // or maybe return some message indicating no threads are available.
@@ -283,14 +319,31 @@ export default function CollabSidebar() {
 		<>
 			<AddCommentComponent onClick={ openCollabBoard } />
 			<PluginSidebar
-				identifier={ collabSidebarName }
+				identifier={ collabHistorySidebarName }
 				// translators: Comments sidebar title
 				title={ __( 'Comments' ) }
 				icon={ commentIcon }
 			>
 				<CollabSidebarContent
+					comments={ resultComments }
+					showCommentBoard={ showCommentBoard }
+					setShowCommentBoard={ setShowCommentBoard }
+				/>
+			</PluginSidebar>
+			<PluginSidebar
+				isPinnable={ false }
+				header={ false }
+				identifier={ collabSidebarName }
+				className="editor-collab-sidebar"
+				headerClassName="editor-collab-sidebar__header"
+			>
+				<CollabSidebarContent
+					comments={ resultComments }
 					showCommentBoard={ showCommentBoard }
 					setShowCommentBoard={ setShowCommentBoard }
+					styles={ {
+						backgroundColor,
+					} }
 				/>
 			</PluginSidebar>
 		</>
diff --git a/packages/editor/src/components/collab-sidebar/style.scss b/packages/editor/src/components/collab-sidebar/style.scss
index 2f937e3df9a25b..2c1426f1dd75df 100644
--- a/packages/editor/src/components/collab-sidebar/style.scss
+++ b/packages/editor/src/components/collab-sidebar/style.scss
@@ -1,5 +1,18 @@
+.interface-interface-skeleton__sidebar:has(.editor-collab-sidebar) {
+	box-shadow: none;
+
+	.interface-complementary-area-header {
+		display: none;
+	}
+}
+
+.editor-collab-sidebar {
+	height: 100%;
+}
+
 .editor-collab-sidebar-panel {
 	padding: $grid-unit-20;
+	height: 100%;
 
 	&__thread {
 		position: relative;