Using course tools>>Collaboration tools>>Virtual Classroom
The Virtual Classroom toolbar appears at the top of the Virtual Classroom window.
Click View to specify whether private messages should appear in the same or a different window.
Click Controls to specify which features to make available to active participants and to passive participants. You can also end the session, removing all the users from it.
Click Clear to clear your display only or the display of every user.
Click End to close the current Virtual Classroom session.
Click Breakout to select participants to include in a separate discussion within the session. Users in a breakout discussion are still active in the main Virtual Classroom session.