diff --git a/shell/browser/mac/electron_application_delegate.mm b/shell/browser/mac/electron_application_delegate.mm
index 72774bcd6783..9f947f4933b1 100644
--- a/shell/browser/mac/electron_application_delegate.mm
+++ b/shell/browser/mac/electron_application_delegate.mm
@@ -56,11 +56,6 @@ static NSDictionary* UNNotificationResponseToNSDictionary(
 }
 
 - (void)applicationWillFinishLaunching:(NSNotification*)notify {
-  // Don't add the "Enter Full Screen" menu item automatically.
-  [[NSUserDefaults standardUserDefaults]
-      setBool:NO
-       forKey:@"NSFullScreenMenuItemEverywhere"];
-
   [[[NSWorkspace sharedWorkspace] notificationCenter]
       addObserver:self
          selector:@selector(willPowerOff:)
diff --git a/shell/browser/ui/cocoa/electron_menu_controller.mm b/shell/browser/ui/cocoa/electron_menu_controller.mm
index 94334af9c275..7c58fb44f9fb 100644
--- a/shell/browser/ui/cocoa/electron_menu_controller.mm
+++ b/shell/browser/ui/cocoa/electron_menu_controller.mm
@@ -560,6 +560,14 @@ NSArray* ConvertSharingItemToNS(const SharingItem& item) {
 
 - (void)menuWillOpen:(NSMenu*)menu {
   isMenuOpen_ = YES;
+
+  // macOS automatically injects a duplicate "Toggle Full Screen" menu item
+  // when we set menu.delegate on submenus. Remove hidden duplicates.
+  for (NSMenuItem* item in menu.itemArray) {
+    if (item.isHidden && item.action == @selector(toggleFullScreenMode:))
+      [menu removeItem:item];
+  }
+
   [self refreshMenuTree:menu];
   if (model_)
     model_->MenuWillShow();