Expanding folder pane in add / edit citation window

I was sure that someone else would have this problem, but I've not been able to find it. It may, also, be a Linux issue.

I like to use a complex tree of folders, often extending to six or seven layers. When I insert a citation very often I cannot see the names of the folders beyond the fourth layer.

Is there any way to extend the width of the folder pane in the add citation window?
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