(Too) many "Settings Manager" icons

[Ulli Horlacher]

This Xfce 4.12 on Xubuntu 16.04

Something has added many many "Settings Manager" icons in this Settings
menu: 

http://fex.rus.uni-stuttgart.de/fop/1SJOsgBq/X-20170220083847.png

How can I get rid of them?

I miss a "edit this menu".




-- 
Ullrich Horlacher              Server und Virtualisierung
Rechenzentrum TIK         
Universitaet Stuttgart         E-Mail: horlacher at tik.uni-stuttgart.de
Allmandring 30a                Tel:    ++49-711-68565868
70569 Stuttgart (Germany)      WWW:    http://www.tik.uni-stuttgart.de/
REF:<20170220074640.GA28742 at rus.uni-stuttgart.de>