How to duplicate activity and remove global themes

laptop n°2-on my laptop TUXEDO InfinityBook Pro fresh upgraded from LEAP 15.6 KDE to leap 16.0
ssd disk=2Tb, CPU= Intel Core i7-8565U, RAM=32Gb, GPU=Intel UHD Graphics 620 (Whiskey Lake) Driver: “i915”;
boot=tri boot (leap 15.5, leap 16.0, windows 10)

I continua to have this problem:

and cannot be able to know what applet block my desktop.

as the problem is activity related I thought to duplicate the activity with problem and start to eliminate something to solve it, googling I read that there could be some problems passing from plasma5 to plasma 6 widget and global themes, so I think I can duplicate activity and remove global themes if there aren’t other solutions.
how can I duplicate the activity?
and how can I remove global theme and other themes from this duplicate activity?

solved clicking on systemsettings>global theme>switching to a global theme and selecting both “appearence desktop” and “dektop and windows layout”

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