The next version of macOS is expected to add a feature, codenamed “Sidecar,” which lets you extend your Mac’s desktop to a second monitor or even iPad —functionally the same way as the third-party Luna Display and other software utilities.
The forthcoming macOS 10.15, likely to be revealed at Apple’s WWDC conference in June, is expected to add a new feature to help you make the most of all your displays —whether they’re monitors directly plugged into your Mac or just iPads that are nearby. This display feature is reportedly codenamed “Sidecar,” and its function is the same as that currently available from Luna Display by developers Astro HQ.
In both systems, you effectively extend your Mac’s desktop to your other screens, such that as you drag a window off one, it appears on the other. Also in both systems, if your extra display is an iPad, you will see the regular macOS interface on it but you’ll also be able to touch the screen and use the Apple Pencil.
Read more at AppleInsider.com