In small meetings, it’s customary for most or all participants to be on camera, but in large meetings, meeting organizers may want to prevent attendees from turning on their cameras and mics to minimize distractions and improve call quality.
To do so before a meeting takes place, go to the “Meeting options” pane as outlined in the previous tip and turn off the Allow mic for attendees? and Allow camera for attendees? switches. Then click Save.
To prevent people from turning on their cameras or mics when a meeting is already taking place, click the three-dot (More actions) icon at the top of the Participants pane and select Disable mic for attendees or Disable camera for attendees.
Meeting organizers and presenters can also prevent specific people from turning on their cameras or unmuting their mics during a meeting. Open the list of participants, click the three-dot (More options) icon next to the person's name, and select Disable mic or Disable camera from the menu that opens.