This conversation has been merged. Please reference the main conversation: Problem: Lightroom 'Close' and 'Restore' buttons vanish in full screen mode in macOS Mojave
After some editing, especially if I use menu functions such as undo, the menu drops down but the minimise bar then ceases to appear. The menu bar drops down and I can just make out the minimise bar brifely flashing - but it doesn stick around to be clicked on.
I can minimise the screen by selection of 'Window' and 'Exit full screen'. All works then works well for a while until the minimise drop down just ceases to work again - apparently spontaneously.
Also, I have noticed that if you try to import to the Library when the drop down isnt working, it is impossible to cancel the selection as tne canceland Import buttons on the lower right are not visible
Close full screen is a temporary solution but shouldnt be necessary