Baseline (Widescreen) Solution & Issues
Native HOR+
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Optional FOV via hex edit:
To gain a higher FOV you need to hex edit --> ...\steamapps\common\RIVE\rive.exe
Go to Offset 4254D0 look for 39 8E E3 3F and change it to 39 8E 50 40
Ultra/Super-Wide (21:9/32:9) Specific Solution & Issues
You need to override the aspect ratio restriction by passing:
--no_aspect_ratio_restriction
As a commandline parameter to the game.
OR
via Hex edit: HEX edit aspect ratio: Go to --> ...\Steam\steamapps\common\RIVE\rive.exe
Change in OFFSET 4254D0: 55 C3 EC 3F --> 55 C3 FF 40
Also here highly recommended to change the FOV to 39 8E 70 40 - see Additional Screenshots
Eyefinity / Surround Specific Solution & Issues
You need to override the aspect ratio restriction by passing:
--no_aspect_ratio_restriction
As a commandline parameter to the game.
4k UHD Specific Solution & Issues