The monitor I was playing on has a resolution of 3240 x 2160 (3:2, bit strange tbh) which would explain the cutoff. I suppose it's the opposite problem to ultra wide screen where my screen simply wasn't wide enough.
In my case, I wouldn't mind letterboxing or something if that's the only way to display it on my resolution, but I imagine there are also other scaling modes and such that could make the game work at an unusual resolution like this one. Thanks for your response!