If you want to hide program from menu, open file with text editor and add this line:
If you want to move program from one menu place to other then you need to edit line in which there is word category. There you need to insert name of desired category, all less useful programs I moved to other. If you want to move from one to other category clear all, previous categories in that file and insert new one, but beware that program might be missing in Settings-Settings panel. but programs still work:
In order to know what category to input, open .desktop file of program which is in that category. For example Internet, Firefox is in there.
Deleting items which are not in place above, these might be your own created program links, such as conky, you need go to directory and delete files with name of program:
Also there is function (right click on app icon on opened windows) to do all what is needed. Bellow is text of one file:
Icon-> you can enter full path to .png file which will by used as icon
[Desktop Entry] Type=Application Name=RadomApp Exec=randomservice Categories=Settings; Icon=random.png
In some files there are “Generic Name”->> it text which will by in () example: LeafPad (TextEditor). You can remove that text or you can turn it off in Settings panel->Menu. In there search for selected Generic.
PS: when entries from categories are moved or hidden, and there is no left entries in a category visible, menu for that category will by hidden, until new visible entries added.