KDE desktop styling and usability problems 2

Wiki pages are not the best place to progress developments in a problem, but they are more controllable than the time ordered blog entries. The next step in this thread is Plasma 6 KDE with X11 on Tumbleweed which is the situation as of 7/7/2025.

Application UI scaling was a previous note on the problem of fonts on the KDE desktop, but this is an attempt to document exactly what I AM seeing.

The starting point with all this was the high resolution monitor that I switched to as the four 27" HD monitors were no longer available. It was augmented by a 19" HD monitor, but that just seemed to confound things, so having saved up a little money, a second reconditioned 32" 4k monitor now sits in it's place. Yet still things are proving to be difficult. I KNOW that the starting point should be to simply wipe everything back to default, but just how precisely does one do that? In X11 I have a global scale option on the Display & Monitor Display Configuration page wh