There is a potential fix that has helped some players who have Riva Tuner installed, detailed in this community post: https://steamcommunity.com/app/421170/discussions/0/1630791694323676418/
Also, please try disabling fullscreen optimizations as detailed in this knowledge base article:
https://support.505games.com/en/support/solutions/articles/24000047708
Finally, verify your Steam installation by right-clicking on Indivisible in your Steam Library and select Properties > Local Files > Verify Integrity of Game Files...
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