I know I have seen this topic , but can't find it. I removed the budgie-desktop to get ready for upgrade to 17 and now I need to restore the Zorin wayland option and gear icon in the login screen. I know it is a matter of reinstalling a package.
Do you need the way to get Wayland installed on your machine? Or, are you looking for the configuration options for Wayland after it's already been installed?
Consider:
To reinstall Wayland if it's not: sudo apt install gnome-session-wayland
To enable the gear icon to switch between sessions: sudo nano /etc/gdm3/custom.conf
Find and uncomment: #WaylandEnable=false by deleting the hash symbol and change to true.
Restart GDM: sudo systemctl restart gdm.
Hopefully that brings back the gear at the login screen.
If you removed the Budgie DE and used something else, I'm willing to bet those steps are what you need.
Let us know how the steps work out for you. If they don't, just reverse. If you don't find the custom.conf file, do a search for it, but it should be in your root directory, in /etc.
Back to normal, just installed the wayland-session logged out and the icon was restored. I may add budgie again after upgrade to Zorin 17 , but wanted to start with clean system. Thanks