I used to love the Cube Desktop in Compiz, and was excited to find it again in Window Management/Desktop Effects. Sadly however, it was non-operational. It simply doesn’t work in X11 at all, and while the settings page shows up in Wayland, the effect itself doesn’t work.
Why?
Because qt6-quick3d didn’t get installed. during the initial install.
To install, I used this command:
sudo dnf install lib64Qt6Quick3D.znver1
After that, restart Wayland (log out and log in again, or however you want), and the cube effect starts working!