Is there any way to change settings by editing a file?

I want to try the game on a 4k 60hz monitor, but it’s running up incredibly tiny on the screen, so small that I can’t use the UI to change any settings to fix it. Is there any way to change settings by editing a file so I can make it fill the screen? This is what it looks like right now:

image

Okay, never mind, I’ve fixed it. I’ll leave it up in case anyone else ever has the same problem. The fix was to use the windows keyboard shortcut to maximise an application: win key plus the up arrow, that fixed it.