Microsoft Teams meeting and chat banners are useful but at times distracting. A blessing and a curse for many! Whilst there is currently no built-in option to specifically disable all notifications when your status is set to “in a meeting”, there are ways to stop chat notifications.
This video demonstrates how to use the Mute feature for Chat to switch off banners for specific meeting chats and how to control Chat notifications in general via your User Settings.
Bonus Tip! Setting your status to Do not disturb will mute all Teams notifications and provide a quick fix but you should remember to reset your status after your meeting.