I've seen some misinformation about this game. Hopefully this helps.

The game does in fact support resolutions higher than 2560x1440, despite them not being available in the options menu. If you have a display with a higher resolution in either direction, play in windowed fullscreen mode. The game will scale to your resolution properly. True fullscreen will result in the selected resolution stretching to fit your screen, regardless of aspect ratio.

This also applies to ultrawide. I have a 3440x1440 monitor. It renders beautifully with 2560x1440 selected with windowed fullscreen. It stretches horizontally if in true fullscreen.

You can also set the FOV using the console with Unreal Engine Unlocker. It resets when you die or otherwise go into a hard loading screen, but it sure beats not having an option at all.

Here is proof of the resolution scaling. Both of these screenshots were captured on a 4k display. One was in windowed and one in true fullscreen. Open the images directly and you will notice the 4k image (the first one) is of much higher quality and is actually a 4k image. The second one is a 1440p image.

https://imgur.com/a/k63CJEx