Sidecar and Fast User Switching

I am thinking about getting an iPad for an external display for a Mac mini and have a couple questions about how it would work:

  1. If you use Fast User Switching to switch to a different user, what happens to the Sidecar display?
  2. If the display sleeps, what happens?

Nobody was able to give me answers to this online, so I tried it with my wife’s iPad and MacBook. Here’s what happened:

  1. When you switch to a different user, the iPad display shows the login screen background, but no login prompt. The login prompt shows on the primary display. After you login with the new user, Sidecar disconnects. And you can’t use Sidecar with a user that is not signed into the same iCloud account as the iPad is.
  2. When the primary display sleeps, the iPad shows the iPad login screen. When the primary display wakes up, the iPad automatically wakes and shows the secondary desktop.

Luna Display/Astropad can’t really switch between two users either. Here’s what their helpful support rep told me: “When you switch to the second user, even without User A fully logging out, the [Luna Display] app will still remain running on the iPad and keeps the last-known screen images on display. This means that User A’s screen contents will still remain on the iPad after User B logs in, and Astropad will remain connected to User A even if User B opens the Astropad app, until the connection is stopped by either quitting Astropad before switching to User B, or closing and restarting the iPad app.

I did find an interesting way to Sidecar to a headless Mac mini from the iPad, via a shortcut.

I only have space left on my desk for something about the size of an iPad. A 10″ IPS monitor of dubious origins costs $120-$140. It would have a lower PPI vs. an iPad, a lower quality display, and not be as generally useful. Though it would allow Fast User Switching. The iPad and iPad Air sometimes go on sale around Veteran’s Day for $279-$289, so for double the price I get a full iPad built into the display. Not bad. I think I’ll get one!

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