If you’ve updated your Mac to the Catalina OS and your iPad to the iPad OS, there’s a great feature you’ll want to check out.
You can now use your iPad as a second screen with your Mac thanks to a feature called Sidecar. You have the choice of making the tablet a second screen to expand your work area or mirroring what’s happening on your Mac.
This can happen either wirelessly or you can plug your iPad directly into your Mac using the iPad’s charging cable.
Then click the AirPlay icon on the menu bar at the top of your screen. Select your iPad from the drop-down menu.
Your iPad will now be an extension of your desktop. You can move windows over to it just like you can with any two-monitor setup.
To move a window to the iPad display hover a pointer over the green full-screen button at the top left of the program window and wait for a menu to open. Choose Move to iPad from the drop-down menu.
To turn it into a mirror display, click the AirPlay icon again at the top and choose Mirror from the drop-down menu.
To turn off the second screen, just tap the Airplay icon again and click on Turn AirPlay Off in the menu.