Muting all attendees
Meeting hosts, moderators, and delegates can mute all attendees. This gives hosts, moderators, and delegate more control over who can speak during a meeting. We recommend that you turn off meeting notifications while this feature is on when you host a large meeting.
To mute all attendees
In the left control bar, open the More options menu ( ).
Choose Mute all others.
To unmute all attendees, repeat the previous steps.