This article will show you how to set security preferences on a mac

When you first try to share your screen on a google meet, you will get an error message saying that you need to enable it in System Preferences. Below are the steps to do this: 

* Click System Preferences then Security and Privacy

You will next get the Security & Privacy screen. 1st, click The Privacy tab, then scroll down to find Screen Recording on the left. Click Google Chrome in the list on the right. 

Once all that is done, you will get a message that chrome will have to be quit in order to allow screen-sharing. This will kick you out of any active google meets. Select Quit Now and then rejoin any meet, reload any browser pages needed.