Editing the XFCE application launcher menu

[Phil]

I've upgraded from Xubuntu 21.10 to 22.04 and now 1 sub menu is missing 
from the application launcher menu. The missing sub menu appears in both 
of the menu editors "menu editor" and "main menu". How might I reinstate 
the missing sub menu so that it appears in the application launcher?

By the way, I had no end of trouble editing the Application launcher 
menu under 21.10 with the default menu editor ("menu editor"). 
Everything fell into place after I discovered the menu editor "main menu".

An extensive Internet search has not revealed a solution to this problem.

-- 
Regards,
Phil