Same exact issue, I have 2 external monitors with my iMac and I use all 3 screens simultaneously. I Day trade so I have me Set up saved to go to all screens as I need it when I log into the trading platform. It was working fine until the Big Sur update. Now only my Mac screens shows and the windows that should be on the other monitors just minimize into one small tab behind my Mac screen. So every morning or everytime I log back into the platform I have to manually move everything back to it's correct place and size. VERY FREAKING FRUSTRATING!
REP912
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Vidalia, GA, United States