Google Meet issues? - If you are using the Grid View extension try Removing it and it may resolve the issue - see how (via @BCor_2 ) | mlearn | Scoop.it
From docs.google.com - September 10, 2020 12:28 PM
Google Meet Issues?? Some users have been experiencing issues with Google Meet. For example, the sound is not working, or the grid view is not functioning etc. The problem may be that there is a glitch with the extension Google Meet Grid View (this is the 9 square extension shown below)

Via Tom D'Amico (@TDOttawa)