I found that in some programs like the device's simulator of Xcode, you can move it to the iPad, activating the Sidecar function. So the sidecar function works but I don't understand why is not yet available in the finder...
DavidBermudez
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
From
Londres, Inglaterra
Post
Replies
Boosts
Views
Activity
Also you can activate in Configuration --> Screens --> AirPlay Screen (click on it) Select iPad