How to use Sidecar to make your iPad a secondary Mac display in macOS Catalina and iPadOS

If your Mac is running macOS Catalina, you can now use your iPad as a secondary monitor with the new Sidecar feature. It’s ridiculously easy to set up wirelessly through AirPlay.

First, a few notes. Unlike with some existing third-party screen-sharing apps such as Air Display 3, you can really only use your fingers on the display for simple actions such as scrolling through text.

The Apple Pencil works as a “mouse,” though—and that includes using it to alter and create images through the full version of Adobe Photoshop while we’re