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To avoid random noise and visual distractions, you can disable attendee mics and cameras. Then, when you want someone to speak or be seen, you can let them turn their mic or camera back on. Learn how to manage audio and video permission in Teams meetings.
In this topic:
Desktop
Prevent mic and camera use
Before the meeting
After scheduling the meeting and sending out the invite, the meeting organizer can disable the mics and cameras so that attendees can't use them during the meeting. All attendees (but not presenters) will join the meeting with mic and camera off.
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Go to Calendar and double-click the meeting.
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Select Meeting options near the top of the screen.
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Turn off the Allow mic for attendees? or Allow camera for attendees? toggle and select Save.
During the meeting
The organizer and presenters can disable the mic or camera of all the attendees, or of individuals, at any time during the meeting.
Note: Currently this option isn't available to organizers and presenters who join the meeting from Teams room devices.
To disable all attendee mics or cameras
Tip: If you just want to mute participants without disabling their mics, select Mute all participants.
If later you want to enable everyone's mic or camera, select More options 
again and then Allow mic for attendees or Allow camera for attendees.
To disable an individual's mic or camera
Tip: Attendees can signal that they want to speak by raising their hands.
Allow someone to unmute or share their video
That person can now unmute themselves or share video.
Mobile
Prevent mic and camera use
Before the meeting
After scheduling the meeting and sending out the invite, the meeting organizer can disable the mics and cameras so that attendees can't use them during the meeting. All attendees (but not presenters) will join the meeting with mic and camera off.
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In the Teams calendar, open the meeting event and select Meeting options.
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Turn off the Allow mic for attendees? or Allow camera for attendees? toggle and select Save.
During the meeting
The organizer and presenters can disable the mic or camera of all the attendees, or of individuals, at any time during the meeting.
To disable all attendee mics or cameras
Attendee mics and cameras will appear dimmed.
Tip: If you just want to mute participants without disabling their mics, go to the participant list and select Mute all next to In the meeting.
To disable an individual's mic or camera
Tip: Attendees can signal that they want to speak by raising their hand.
Allow someone to unmute or share their video
That person can now use their mic or camera.