Hallo, I am on macbbok pro 2019. After I upgraded to Big Sur when I share my screen during a zoom meeting, after a while people on the other side see my screen sharing frozen. Any ideas? Perhaps it is a bug in Big Sur because i had no problems with previous mac os version. UPDATED: After spending the whole day testing various things I think I solved my problem and I would like to share it to anyone who might experience the same thing. The problem is that the macbook was using the Intel UHD graphics card (for light jobs) and not the independent AMD Radeon Pro 5500M 4GB or anyway was switching between the two and that was causing the freezing in screen sharing. All I had to do is go to SETTINGS -> BATTERY -> chose Power Adaptor and uncheck Automatic graphics card swicth. This will enable permenantly the AMD card. I've been screen sharing for 4 hours with no problems!! Peace!!!