I'm on 3440x1440 and it's quite frustrating.
In Windowed Fullscreen the game locks itself in 3440x1440 but the field of view is terrible. Not only is it Vert- (cropped at the top and bottom instead of expanded on the sides), the whole view seems distorted.
In Fullscreen I can choose between various resolutions but none of them is 21:9. What's worse, there isn't an option for 2560x1440 which would allow me to play the game as intended on 16:9 screens.
If I try to settle with suboptimal 1920x1080, the screen gets stretched to 21:9 no matter what scaling option I choose in AMD Radeon.
Devs, please help!