The game is always noticeably low-res when in full screen.
Changing from maxed out window to fullscreen completely pixelates the font and shows dithering artifacts in alpha tests and generally more aliasing.
This behavior is sadly impossible to screenshot from the machine, as any attempt to create a screenshot hides the problem in the recorded image. The closest I could get was with Steam’s screenshot feature, but it outputs the result at the wrong resolution. I have included it as a clue.
To show off the messed up font rendering very roughly, I have taken a picture of the screen, too.
Resolution is fine when focus is on second (smaller) monitor:
When the game has focus and is in full screen, steam screenshots come out the wrong size(2048x1152):
Picture taken with camera to show off the borked font (only way to capture the problem, sorry):
Server & Time
Menu 15:20 Saturday, 31 October 2020 Greenwich Mean Time (GMT)
Steps to reproduce
1.) Have two (resolution mismatched?) screens
2) Put game in full screen via options or alt+enter
3.) Click in and out of the game
(5 link limit have mercy)