help me with xfce 4.2.1

[Alaios]

In the setting i can see only 6 icons
(Display,Keyboard,Mouse,Taskbar,User Interface,Xfce
Panel) I think that are more icons that only these

Except from these i do a right click to the
desktop->Setting->Xfce4 Desktop Settings and gives me
the message

XFCE Settings Manager error:
No such plugin "backdrop"

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