
Something weird happened to my full screen mode.
Today, while working on a project, I switched to full-screen using the keyboard shortcuts. I might have clicked the wrong keys, 'cause I was looking at the monitor, not at the keyboard. Scrivener crashed. When I re-opened the project, Scrivener wouldn't switch documents in the editor window (when I tried to switch between different documents in the binder, it kept showing the same document -- the uppermost, i.e. the first, in the "Draft" folder)).
I restored a backup of the project I made yesterday when everything was working okay. Scrivener opened it, and I could switch between binder documents again, but the full-screen view was messed up (see attachment): the ruler keeps showing.
I uninstalled Scrivener with AppZapper, then reinstalled a newly downloaded version. Full Screen is still showing the ruler.

Help?