How to Prevent Notifications when Screen Mirroring on a Mac

Part 1 of 2:

Enabling Do Not Disturb

Click the Notification Center button. This is located in the upper-right corner of the screen.
Click the Do Not Disturb switch.
Click the Notification Center button to close the panel.

Part 2 of 2:

Changing Your Settings

Click the Apple menu.
Click System Preferences. Click the Show All button at the top of the System Preferences window if the regular options don't appear. The Show All button has an icon of 12 dots in a grid.
Click the Notifications option.
Click Do Not Disturb.
Click the When mirroring to TVs and projectors box.^[1]

David Pac

Update 04 March 2020

You should read it

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How to Prevent Notifications when Screen Mirroring on a Mac

Enabling Do Not Disturb

Changing Your Settings

You should read it

May be interested

Mac OS X