XFCE scatters its system-modification utilities like sand dollars on the beach, and unfortunately my netbook is out on loan right now so I can't be very specific.
So, in System -> Appearance or Accessories -> Settings or some darn place, there's a window with around 20 system-management utilities. One permitted me to define which applications would go in which category of the panel's Applications menu. It's *not* called "Menu Editor"—that one only changes what's available from the context menu in the file manager.
Sorry I can't be more helpful, but it's why I'm sticking with factory-installed OSes.
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So, in System -> Appearance or Accessories -> Settings or some darn place, there's a window with around 20 system-management utilities. One permitted me to define which applications would go in which category of the panel's Applications menu. It's *not* called "Menu Editor"—that one only changes what's available from the context menu in the file manager.
Sorry I can't be more helpful, but it's why I'm sticking with factory-installed OSes.