Preview has two distinct kinds of full screen mode:
- The normal full screen mode that most macOS applications have (View > Enter Full Screen)
- Preview's special slideshow mode (View > Slideshow)
In slideshow mode, whenever you move your mouse, slideshow controls will appear at the bottom of the screen. They look like this:

However, since I upgraded to macOS Monterey, these controls also appear when I open a PDF in ordinary full screen mode. This is really annoying when I try to read and looks like a bug to me, as it wasn't there before.
The problem only occurs after the mouse pointer has been hidden at least once, which automatically happens after a few seconds of not moving it.
Is there any way to disable the slideshow controls in normal full screen?
Edit: In the meantime, I also noticed that the slideshow mode (that isn't particularly useful for PDFs but nevertheless exists) is now totally messed up: When you start the slideshow and press any key, Preview will end the slideshow, as can be seen in the View menu: The View > Slideshow menu entry is selectable again!
I think this is related to the problem I asked about—the entire slideshow vs full screen logic is confused.
if
statement in the code base. This behaviour didn't use to be there…