The first game had a little Unity configuration tool when you launched it. I checked all the config files and none of them contain resolution.

I ask because my monitor is 3440 x 1440, and because this game doesn't handle ultrawide well, I'd just normally set it to 2560 x 1440 so the top and bottom don't get cut off... provided I can find the option to do so. There's an in-game graphics setting but the only relevant option is windowed mode, which I do not want.