Moderators have the option of enabling or disabling any of the Conference i/o features at any time. When a feature is disabled it will not be visible on the audience's screens, and they will not be able to interact with it.

To disable a feature click 'Sessions Settings' at the bottom of the pageĀ 

Then click "Enable / Disable Features"

Then disable the desired feature(s) by clicking the lock icon next to that feature