fixes #70681

src/vs/workbench/browser/actions/listCommands.ts

@@ -582,8 +582,14 @@ KeybindingsRegistry.registerCommandAndKeybindingRule({
 		else if (focused instanceof ObjectTree || focused instanceof DataTree || focused instanceof AsyncDataTree) {
 			const list = focused;
 			const fakeKeyboardEvent = getSelectionKeyboardEvent('keydown', false);
-			list.setSelection(list.getFocus(), fakeKeyboardEvent);
-			list.open(list.getFocus(), fakeKeyboardEvent);
+			const focus = list.getFocus();
+
+			if (focus.length > 0) {
+				list.toggleCollapsed(focus[0]);
+			}
+
+			list.setSelection(focus, fakeKeyboardEvent);
+			list.open(focus, fakeKeyboardEvent);
 		}
 
 		// Tree

src/vs/workbench/contrib/files/browser/views/explorerView.ts

@@ -337,17 +337,6 @@ export class ExplorerView extends ViewletPanel {
 		}));
 
 		this.disposables.push(this.tree.onContextMenu(e => this.onContextMenu(e)));
-		this.disposables.push(this.tree.onKeyDown(e => {
-			const event = new StandardKeyboardEvent(e);
-			const toggleCollapsed = isMacintosh ? (event.keyCode === KeyCode.DownArrow && event.metaKey) : event.keyCode === KeyCode.Enter;
-			if (toggleCollapsed && !this.explorerService.isEditable(undefined)) {
-				const focus = this.tree.getFocus();
-				if (focus.length === 1 && focus[0].isDirectory) {
-					this.tree.toggleCollapsed(focus[0]);
-				}
-			}
-		}));
-
 
 		// save view state on shutdown
 		this.storageService.onWillSaveState(() => {