[Easily removing files]

Hello,

 

I recently installed CC Cleaner and I am trying to remove duplicate files. The problem I am having is searching.  I am trying to search on a specific drive for a type of file maybe music or PDF, but I'm not getting any results. How would I enter this information in the search?

 

Also, is there a "select all" feature to select all the checkboxes at once?

 

Thanks