Full screen does not work on macOS

[Former user]

Enabling fullscreen on macOS results in black bars on side of screen with square aspect ratio. Trying to add flags to launch options for correct resolution results in game opening with fullscreen working correctly for about 2-3 seconds before resulting to black bars on sides.

[Brian Bucklew]

you have to set the resolution to “unset” for it to stick, but yes known issue.