Can I shrink gedit's side panel?

My laptop screen is fairly small and gedit's side panel won't go smaller than about 400 px. It is a little exasperating because I can't have any other windows visible if I want to use anything in the sidebar, because it crowds out my document.

Is there a setting someplace that I can fiddle to make it smaller? I've looked everywhere I can think of for it!

Won't go any smaller

I can drag it down to the width you see below, but I can't drag it any farther than that.


Turned out it was a plugin. (GDP Find)

Figured that out by turning off my plugins one by one.