In Tutoom you can join or leave all the available Rooms in your session, learn how to leave one.

First you must be inside one, learn how to join a room.

Once you're in a room, to leave you must click on the Leave group room icon in the communication buttons.

Then, you'll be taken to the main session.

The messages and notes you write will be deleted once the Rooms are over.
You can join and leave rooms as many times as you want.