fullScreenAccessoryView
The toolbar’s full screen accessory view.
Declaration
var fullScreenAccessoryView: NSView? { get set }Discussion
When entering full screen mode, the accessory view is removed from the window if necessary, and attaches underneath the toolbar.
When leaving full screen mode, the accessory view is returned to the window, if it was in the window previously.
To customize this behavior, you can implement the NSWindow delegate method windowWillExitFullScreen(_:).