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https://steamcommunity.com/app/252950/discussions/3/4630359652384650559/
Edit: Also when you renamed the Rocket League folder in Documents did you disable Steam Cloud prior? Also make sure your documents folder isn’t on your OneDrive. If you’ve linked your Documents folder from the OneDrive account, you need to unlink it first. Otherwise, it would cause the issue.
Edit: This discussion might also be relevant: https://steamcommunity.com/app/252950/discussions/3/7599331177369998496/
Edit: Another relevant discussion:
https://www.reddit.com/r/RocketLeague/comments/1amscqc/my_rocket_league_wont_launch/
Here's a possible solution: https://www.epicgames.com/help/en-US/c-Category_RocketLeague/c-RocketLeague_TechnicalSupport/why-do-i-see-a-black-screen-in-rocket-league-a000084259
If that doesn't work could there be something you could configure in the GeForce Experience or Nvidia Control Panel so you don't have to unplug your second monitor each time?