I have Kubuntu 20.04 LTS version. I have two monitors connected to my PC - primary one via HDMI and secondary via DisplayPort. Both have the same resolution.
After login into KDE I have the 'task panel' and the 'application launcher' on the correct (primary) monitor. But sometimes I dont have any 'desktop' - just black screen (when I minize all windows) on the primary monitor. I have correct desktop wallpaper on the secondary monitor - but of course, without any widgets since they are placed on the primary one.
I don't know exact steps to reproduce, because it seems this is happening randomly - sometimes I have the desktop wallpaper and sometimes i don't. In all cases I have wallpaper on secondary monitor and I have the 'main panel' and 'application launcer' visible on the primary one (but not the other widgets, icons and wallpaper)
This happens on different activities too - for some I have the desktop layout as
Desktop and for other I have it as
Any idea what can couse this and/or how to fix it?