In case it will make it easier for anyone -- the "desktop switcher" is called "Desktop Preview & Pager" in the KDE "Add Applet" menu/dialog. To find/open it, right (i.e. secondary) click on an empty part of the Panel & (primary) click "Add A
pplet to Panel...", it's the 5th one down in "Add Applet".
Terminology lesson for the recent "refugee":
- "Panel" is Linux term for what M$ calls the "Taskbar".
- In Linux "Taskbar" means only the part of the Panel w/ the buttons for running windows.
- In KDE (only) the Panel is also called the "Kicker".