The + and - keys worked! Thank you so much.
As for the resolution, it's kind of a big res because of my monitor being a very wide gaming monitor, but it's 2560 x 1080
Viewing post in Issues reporting and feature requests
Ahh thanks, that indeed might have something to do with it. Not the high resolution per se (I use a 4K monitor, for example), but the aspect ratio. I'm going to add code to check for wider than 16:9 when maximizing.
edit: I think it's done already, that seemed simple. Should go live on the next public update.