Sidecar only shows a black screen on iPad until reboot

Question

It is 100% fixable by rebooting my Mac. It is also 100% annoying when I have to do that. After the reboot I can use Sidecar wirelessly very reliably. Until I disconnect. Or change any Sidecar setting (Like: Show touch bar on/off). After that there is a good chance I have to reboot my Mac for it to work again.

1. Why does it do that?
2. How do I temporarily fix that? (Say: Is there a terminal command?)
3. How do I permanently fix that?

Answer 1

I found that if you go to display preferences -> arrangement -> tick and then untick mirror display option it will work but I would have to repeat this step every time I use sidecar :)

Answer 2

when you try to reconnect sidecar, you can click mirror display after connecting your iPad.After that, you will find your iPad get bright.Then canceling mirror operation.

Answer 3

Toggle mirror displays on and off by pressing command-F1 twice.

Answer 4

In case you have multiple displays connected (and one of them is iPad), toggling mirror off/on was not working for me. What helped was to disconnect other displays and then try toggling mirroring tricks when only the iPad is connected.