On nation maps, you should have, in the top left corner, the zoom in/out button, and in the top left, the fullscreen button, but recently over the past few days, they've been missing. However, as I was looking into this, I found that when you hover your mouse where the buttons should be, the mouse changes from the arrow thingy to the pointing finger thingy like it should, and when you click, the intended purpose of the button works. The video shows the problem.
Screen recording 2022-08-05 12.18.32 PM.webm