/usr/local/bin/startplasma-wayland.sh
... but I'd first verify that the script even exists, and doesn't try to start kde5 by accident...… kde5 conflicts …
For testing it would be great to have KDE Plasma 5 and Plasma 6 installed at the same time, so it is easy to switch between the two.Short answer: it ain’t gonna happen. 𠈶…
I should encourage testing sooner rather than later.
With methodical use of ZFS boot environments, disruption should be minimal when reactivating an environment with Plasma 5.
the red desktop background to the right is normally on the display to the left (what's pictured is a mash of two desktop backgrounds).