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*** Audio Settings *** Updated 3/13/2020.
When using your Apple computer, go to your Systems Preferences > Sound. From there, choose the Input tab. Here you can adjust the sensitivity settings of your laptop’s built-in microphone.
See this article: https://support.apple.com/guide/mac-help/control-access-to-your-microphone-on-mac-mchla1b1e1fe/mac
Once you’ve adjusted your computer’s microphone, you can also adjust the audio settings within the Google Meet interface.
See this article: https://support.google.com/meet/answer/9302964?co=GENIE.Platform%3DAndroid&hl=en