Baseline (Widescreen) Solution & Issues
The game will always start at your current desktop resolution. In-game resolution setting only controls the 3D renderer and does not reflect the settings normally available on your system.
Screen change is Vert- but the FOV baseline seems to be 16:9. Anomaly: Warzone Earth was strictly Hor+, though.
Subtitles are cut-off in ARs lower than 16:9.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Native support.
FMVs are windowboxed.
Eyefinity / Surround Specific Solution & Issues
Native support. To play on a single screen, your desktop must be set to single-screen.
Side bar icons are slightly distorted.
FMVs are windowboxed (letterboxing embedded in video stream).
4k UHD Specific Solution & Issues