When in a teams meeting if you share just a single application you don't see the notifications popping up, but it's cumbersome if you need to switch to demo something or share a different application (stop sharing, share new app, stop, reshare to get back to prev content). If you share the desktop which is the easiest and most fluid option, you need to remember to go to settings and set banner notifications for Teams chat to off or everyone sees your chats popping up! Then remember to set it back to on or you'll miss chats that come in :(
Maybe I've overlooked the shortcut to easily toggle the chat banner notifications on and off? If not, would be a really good feature to have!