The patchers for 21:9, 32:9 and 48:9 resolutions remove black bars from the game.

GOG players can simply unpack the archive and use the applicable patcher to modify \PlanetAlpha\Binaries\Win64\PlanetAlpha-Win64-Shipping.exe

Steam players must follow the first steps of this guide. Getting errors at launch means you haven't done it!

Press Alt+Enter to select your resolution if the game starts "zoomed in" (unrelated to the patchers).

Tested the latest Steam version at 2560x1080, 3840x1080 and 5760x1080.

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