In the library of the Klett Augmented App you can see all available titles. Here you choose your book.
Search title: Enter the title here to quickly find the book you want.
Sort: Here you can sort all titles alphabetically or chronologically (time of upload in the app).
"My List": Click on the "+" symbol to add the title to "My List". Then you will find it again when searching next time.
Last selected: The first title in this list is always the last selected.
Close: Click the arrow in the upper right to exit the library.