I had KDE running on Wayland mostly OK, but some glitches caused me to switch the session back to X (in exchange for other glitches I already know how to deal w

I had KDE running on Wayland mostly OK, but some glitches caused me to switch the session back to X (in exchange for other glitches I already know how to deal with). I never asked to switch, it happened when upgrading to 35. It also means I don't know how to install the X session.