Fullscreen Fix

[Valegator]

I had a problem where the game would crash when I tried to switch it from windowed mode to fullscreen. I was still able to change resolutions without a problem. Then I found Fullscreenizer, a program that can force the game to run at fullscreen without borders.

So what you do is download and run Fullscreenizer, run the game. Then on Fullscreenizer click "Show All", select your game, click "Add". Now you can click "Fullscreenize", and you're game is now fullscreen. You can also set up the hotkey that would make your game fullscreen.
Note: This program won't disable the steal overlay, or get you banned for using it.

Edit: old links got broken so here is the reupload of the program.
Dropbox: https://www.dropbox.com/s/es4s48clisjpknc/Fullscreenizer.zip?dl=0

You can also use Lossless Scaling to get the same effect and some fps boost.
https://store.steampowered.com/app/993090/Lossless_Scaling/

[RedArmsVilly]

Link doesn't work anymore so i found this
http://runtimeterror.com/tools/fullscreenizer/

[Thorn23]

Had same thing - some crashes initially changing from Windowed (which it default launched in). Then I tried changing the resolution first (some reason was set to 720p as default) to native 1920x1080, which it accepted, and then changed to fullscreen, which worked!

Then asked it I wanted to proceed with these settings (upon leaving menu, said yes; which showed the AutoSave triangle icon, at which point I decided to Exit and attempt to relaunch, to see if it would remember settings.
Hazzah, It launched beautifully in Fullscreen at preset resolution! =)
*cue the anticipation-building dramatic music*

FYI setup is ASUS TUF A15, Win 11 w 16GB. nVidia RTX 3060, AMD Ryzen 7 5000

Good luck! Hope this helps someone