Usage Tab 

The Usage tab (tab in bottom-right pane) contains a miniature version of the taxonomy tree showing only those categories to which the current attribute is linked (figure below). Use the Usage tab to view the categories to which an attribute is linked, and also to quickly jump to and select any of those categories without having to navigate the taxonomy tree directly.

The Usage tab makes it easy to detect errors in your taxonomy, when attributes that should not be linked to a category show up in the hierarchy of category links.