I must admit that i have never use it because it wasting time and the way it look is not implemented well,
There is two solutions which are better , In genral , (add a nice search bar + embedded with filter logo) , the filter content also can aplied in library’s homescreen by add a section if someone which one of the filter to be as a section on the home library , the other solution add the both filter logo and search bar inside the files section.
This my points of view , pure comes with simple things.