EHM The Blue Line

So if I have the game in full screen, I can see everything great. Everything is top-notch. However, when I go to tab out, the game will no longer function. I can see the game itself but none of the buttons work. So I can play full screen if I don't tab out, but I have a bad habit of getting bored for the .58 seconds the game will process to the next day, and a bad habit of tabbing out when this happens. If I have the game in windowed mode, it functions fine tabbing out and everything. However, the window is pretty small, even on the highest resolution. I have to squint to read stuff. Is there a way to increase windowed resolution?

If you go to the Preferences screen you'll see an option for screen resolutions albeit the options are fairly limited.

You could also override your High DPI settings by right clicking on the ehm.exe -> Properties -> Compatibility -> Change High DPI Settings. This isn't something I've needed to play around with as I have system-wide 250% display scaling (so EHM fills most of my screen in windowed mode at 4k) but that's probably your best bet.