I would like to make the game window run at a higher than the native resolution to take in game screen shots at resolutions like 3840x2160 (4K), but my monitors native resolution is 1920x1080. I tried altering the resolution options in the launcher by setting it to 3840x2160, but that just makes the window fill the screen to it's native resolution. I expected the window to be much bigger than my monitor. Any ideas?
Potentially relevant PC info:
*KDE Plasma desktop on Ubuntu minimal 18.04 LTS
*Radeon R7 360 running the built in drivers for linux kernel 4.15