You can lock control of the Content pane so that other meeting participants can not interfere with your presentation. Other presenters, however, can override this control by unlocking it in their own consoles. After a presenter locks a meeting, other meeting participants can upload files to the meeting, but they cannot select files to display in the meeting.
To lock control of content display
In the Content pane, click Lock.
To unlock control of content display
In the Content pane, click Unlock.