First, this is not a duplicate of
How can I always show the close, minimise & maximise buttons into their own windows?
- I would like to preserve global menus.

Is there a way to only always show the close, minimise and maximise buttons on every application?

The use case is as follows: I have a maximized application in the background, over it is a not-maximized application that has got focus. I want to close the maximized application. I move the pointer to upper left corner. The buttons do not show, since the background application does not have focus. I have to go back, click on it and then go back to the corner to close it. I do that several times a day :-( .