[WindowsCentral.com]

You can now prevent attendees from speaking during a Microsoft Teams' meeting, and in this guide, we'll show you the steps to complete this task on Windows 10.
If you use Microsoft Teams to host webinars and virtual classrooms for employee training in your organization, you can now use the new "hard mute" option to allows presenters to prevent attendees from unmuting their microphones during a meeting.

Full story from the WindowsCentral blog...