Baseline (Widescreen) Solution & Issues
No issues with widescreen here. The lowest resolution that you can set is 1280x720. Anything below that is not selectable.
This game runs on borderless window mode. In order to use DSR or downsampled resolutions, you have to change desktop resolution. Game also suffers from random microstutters because of not having exclusive fullscreen support.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Eyefinity / Surround Specific Solution & Issues
32:9 is the max limit of aspect ratio. So on a 5760x1080p screen, the max resolution that you can set is 3840x1080p. The rest of the area is pillar boxed.
Also at 32:9, one of the option "Tournament" is cropped on main menu. And pause menu ingame crops too, making 2 options missing on the bottom.
4k UHD Specific Solution & Issues