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I seemed to have lost my ability to change resolutions.

A Quick search of this thread (https://steamcommunity.com/app/375440/discussions/0/1837937637886843672/) showed me to add this command line argument (you can do this in the gog launcher in settings)

-show-screen-selector


After that, you will get a selection screen on launch to set your resolution.
Post edited December 05, 2019 by goatman455
The latest patch should add new ingame settings menu that should have the resolution settings.