Previously, Teams users needed to manually open a chat window to view the chat screen. Now thanks to this new feature, chats sent during a Teams meeting will surface on the screens of all meeting participants, making the chat more central to the conversation.
Chat has become a lively space for conversation and idea-sharing and offers an option for people to participate in the discussion without having to jump in verbally. But it can be challenging to pay attention to video feeds, presentations, and chats all at the same time.
With chat bubbles, meeting participants can follow chat on the main screen of a meeting.
This is default on but users have the option to hide chat bubbles during a meeting from the ellipsis 
