With Sidecar, you can turn your iPad into a second display for your Mac and use your iPad as a tablet input device for your Mac apps. Give yourself extra space to work, draw with Apple Pencil, mark up PDFs and screenshots, and more.
Note: You can use Sidecar with iPad models that support Apple Pencil and run iPadOS 13.1 (or later). For more information, see the Apple Support article . To disconnect your iPad from your Mac, click the Sidecar button in Control Center, click the right arrow that appears above the button, then select Mirror Built-in Retina Display. To extend your desktop again, open the menu and choose Use As Separate Display.
Tip: For quick access to the Sidecar options, you can set Display settings Use your iPad as a second display for your Mac in the macOS User Guide.