Show “Content” panel for sections when in “Simple” mode

packages/block-editor/src/components/block-inspector/index.js

@@ -100,13 +100,24 @@ const BlockInspector = ( { showNoBlockSelectedMessage = true } ) => {
 			getBlockName,
 			getContentLockingParent,
 			getTemplateLock,
+			getClosestSectionBlock,
+			getBlockEditingMode,
 		} = unlock( select( blockEditorStore ) );
 		const _selectedBlockClientId = getSelectedBlockClientId();
 		const _selectedBlockName =
 			_selectedBlockClientId && getBlockName( _selectedBlockClientId );
 		const _blockType =
 			_selectedBlockName && getBlockType( _selectedBlockName );
 
+		const closestSectionBlock = getClosestSectionBlock(
+			_selectedBlockClientId
+		);
+
+		const closestContentOnlySectionBlock =
+			getBlockEditingMode( closestSectionBlock ) === 'contentOnly'
+				? closestSectionBlock
+				: undefined;
+
 		return {
 			count: getSelectedBlockCount(),
 			selectedBlockClientId: _selectedBlockClientId,
@@ -117,7 +128,8 @@ const BlockInspector = ( { showNoBlockSelectedMessage = true } ) => {
 				( getTemplateLock( _selectedBlockClientId ) === 'contentOnly' ||
 				_selectedBlockName === 'core/block'
 					? _selectedBlockClientId
-					: undefined ),
+					: undefined ) ||
+				closestContentOnlySectionBlock,
 		};
 	}, [] );
 

packages/block-editor/src/store/private-selectors.js

@@ -567,3 +567,24 @@ export function getSectionClientIds( state ) {
 	const sectionRootClientId = getSectionRootClientId( state );
 	return getBlockOrder( state, sectionRootClientId );
 }
+
+/**
+ * Retrieves the closest "section" block to the given client ID.
+ *
+ * @param {Object} state    - The current state.
+ * @param {string} clientId - The client ID to start the search from.
+ * @return {string|undefined} The client ID of the closest section block, or undefined if not found.
+ */
+export function getClosestSectionBlock( state, clientId ) {
+	let current = clientId;
+	let result;
+	const sectionClientIds = getSectionClientIds( state );
+	while ( current ) {
+		if ( sectionClientIds.includes( current ) ) {
+			result = current;
+			break;
+		}
+		current = state.blocks.parents.get( current );
+	}
+	return result;
+}