When a user not currently in the participant bar reacts with an emotion or raises their hand, this information appears in the bottom left corner of the classroom.
The feed can contain up to four reactions at once, after which a new reaction will push the old one off the screen.
Hand raises are specifically noted.
When four or more users have the same reaction within six seconds, the reactions are rolled up together.
Clicking on any notification with a single user automatically bring them the stage.