You can even add a custom message and a new avatar icon to your Mac computer's lock screen. This can be handy, especially if you live or work in a place where multiple people use the same kind of Mac.

Utilizing AirPlay to share your Mac's screen to a nearby Apple TV will also result in this popup. Click on the Control Center icon in the system tray up top, and select "Screen Mirroring".

How To Split Screen On Mac. If your Mac computer has macOS Catalina, hold your cursor over the green full-screen button in the top left corner of the app you’re using. Select either ”Tile ...