Mute All And Unmute All

https://support.zoom.us/hc/en-us/articles/203435537-Mute-All-And-Unmute-All

During a Zoom meeting it may be useful for the host to mute and unmute all participants that are already in or joining the meeting to ensure there are no interruptions. Refer to the link above for instruction on how to mute/unmute all in Zoom.