Baseline (Widescreen) Solution & Issues
16:9 is natively supported and does not require any third-party tool.
Other aspect ratios require the JASF Aspect Ratio Fixer made by General Admission. Run the tool and select your desired aspect ratio (basically 16:10). Then run the game and select your resolution from the launcher app.
JASF Aspect Ratio fixer only works with the Steam version of the game at the moment. 15:9 is slightly stretched (using the fix for 16:10) or squished (default forced 16:9 aspect). Loading screens and some UI elements (Accept/Back buttons) that are formatted for 16:9 stretch in other aspect ratios.
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
Eyefinity / Surround Specific Solution & Issues
Use JASF Aspect Ratio Fixer to activate 3x 5:4, 3x 16:10 or 3x 16:9 support. A handful of custom bezel-compensated resolutions are also provided, just pick the one closer to your desired aspect ratio.
Then run the game and select your resolution from the launcher app.
4k UHD Specific Solution & Issues