I right-clicked on the app-launcher icon and opened the "KDE Menu Editor". however, not everything in there shows up in the actual menus. For example, "Development" is in the menu editor but not in my actual menus.
So how do I:
1. Add a tab to the app-launcher menu? (Right now it has "Favorites", "Applications", "Computer", "Recently Used", "Leave"
2. Add an application to one of the tabs (and/or a sub folder of that tab)?