Baseline (Widescreen) Solution & Issues
The Game only supports 4:3 aspect ratio - you need to Hex edit to get it HOR+.
I hex edit the Files for FOV, Aspect Ratio and Submarine HUD. There are too many Values to mention - i create the Files for 16:10 / 16:9 / 21:9 / 3x4:3 and 3 x 16x9 . Fix available from the PC Gaming Wiki Community Files (search there).
Just exchange the AN2.dat in your root Folder - AquaNox 2 - Widescreen.7z (This Fix works for Retail, GOG & Steam Version)
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Same Solution as in Widescreen.
Eyefinity / Surround Specific Solution & Issues
Same Solution as in Widescreen.
4k UHD Specific Solution & Issues
Same Solution as in Widescreen.