I believe that you are talking about the KDE 4 desktop. Right click on the desktop ---->unlock Widgets------->Add widgets------>select Folder view and drag to desktop----->select the size of the window that you want. Right click on the Plasmoid that you just added and select Desktop. This will get your Desktop settings back on your desktop. Then right click anywhere on the desktop and select lock widgets.
Hey, thanks you guys. The magic name I was reaching for is “Desktop Folder.” The correct question I should have asked is, “how do I keep my desktop folder when I choose to have different activities for each desktop.” Me feel so stupid. I appreciate your help!