[Zubersoft]

You will need to add some form of metadata so you can easily either sort or filter to separate the two. For example, if you add all the text files to one collection, and the PDFs to another, you can use the collection dropdown at the top left corner of the library screen to select which collection(s) you want to view. Another option would be to take advantage of sorting by sorting on a field such as custom and adding large numbers for the text files and small numbers for the PDFs (something like that, there are many ways to accomplish the same thing).

Mike