If you want to use multiple desktops in KDE and not have the minimized windows from the other desktops showing in the currently open desktop’s panel:
- Right-click on the panel.
- Left-click Task Manager Settings in the menu that opens up.
- Left-click in the check-box next to “Only show tasks from the current desktop”.
- Left-click the Apply button.
- Left-click the OK button.
Obligatory Happy Ending
And they all lived happily ever after. The end.