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kde plasma 5.9.4
I want taskbar to show only contents of current desktop. I do not want to create or use an "activity."
Right-click > Task Manager Settings ... > General
Scroll down to Filters and check Show only tasks from the current desktop.
Task Manager Settings ...
Show only tasks from the current desktop
(This is in plasmashell 5.5.5. I'm assuming 5.9.4 has the same option.)
Required, but never shown