Microsoft teams is the worst video application we use - and we've tried many.
The desktop version allows gallery view but causes the bluetooth connection to crash every time.
We therefore moved to the browser version. Although it takes ages to log in each time, at least bluetooth is stable. However, it's only possible to see one other person at a time.
What a load of rubbish. Thank goodness for Zoom, Skype, WhatsApp, Google, Free Conference Call and the others. We use these in preference to Teams every time.