When I'm in a meeting and I have to write in the chat, someone else will write in the chat and the banner notification blocks my view of the typing area, which is just annoying. I've tried turning off all the banner notifications but it hasn't stopped it.
Just go to the chat tab in Teams. The meeting chat will be visible from here too. Click the three dots (...) next to it and select “mute” now no more banners from this meeting should show up! You can also write from here