Presentation mode is not scaled on x11+hidpi
With evince 3.36.7 in a gnome x11 (not wayland) session on a hidpi screen, the presentation mode uses only the middle part of the screen with half the width and half the height of the screen used.
This seems to be the opposite of #631 (closed). Maybe when that was fixed for Wayland, the fix adversely affected x11 (I'm only guessing here).