Just a note here – if you implement application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask in your App Delegate, then you must also return .all for your Mac idiom too.

A note here – if you implement application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask in your App Delegate, then you must also return .all for your Mac idiom there too.