How do I mute all participants

Click "Show Participants" once you’ve begin the meeting
On the participant list that flies out from the right, click the "Mute All" at top.

Hello Richard_1964,

My name is Juan Pedro, I am an Independent Advisor and consumer of Microsoft products. I will be more than happy to assist you today!

Click on show participants and then you could mute everyone if you are the meeting organizer.

I hope this helped. I will be around in case you need something else.

Thank you.