How to mute whole Google Meet meeting
Meanwhile you can mute single tabs in Google Chrome. Just tested it with a Google Meet session. All you need to do is right-click on the tab and select to mute the website. Still this will mute ALL running Google Meet sessions, not just the one.
To "mute" a single session you can choose a different Speaker in the settings.
The simplest solution is to mute the device by using the device sound controls.
If your device sound controls allow to mute specific applications , mute Chrome.
Related:
Ask Different: How can I control sound from different applications?
You can simply go to that particular tab, right click on it. and mute tab