How to set the background color of the embeded pdf reader of Zotero?

Saintsolo_cdb
Once I installed the Acrobat XI after the Zotero, and I got a new icon which is the same as Acrobate and locates on the left of annoation color selection icon. The new icon supports about 5-6 background color for selecting.Due to some reason, I have to re-install the Zotero, and I could not get the icon back anymore.

I do not know how to attach an image, so I just describe it.

Could anyone help me making it back?
I really appreciate it!!
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