Use a tablet or phone as a wireless extra monitor in Ubuntu 22.04…

NOTE: You have to use Wayland, not Xorg.

gsettings set org.gnome.desktop.remote-desktop.rdp screen-share-mode extend

Next, open the Settings app, navigate to the Sharing panel, and turn on Sharing, and turn on (once it appears) the ‘Remote Desktop’ option. You will want to set up a username and password too, to allow you to connect from a different device.

Use an RDP client on your tablet/phone

Finally, head back to the Settings > Display panel to reposition your virtual monitor, configure the screen resolution, etc. Remember: any multi-monitor behaviours you’ve tweaked elsewhere (e.g., ‘show dock on all monitors’) are respected by virtual monitors too.

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