Folders in the reader library


I’m adding different types of books on different topics. They’re sorted in folders:

-E.g. Books/Languages Books/Algorithms

But the books are sorted in recent order only.


I have been experimenting…
When in the Library, press the Menu button (either the physical menu button at the bottom left or the menu icon in the top right corner), then take the option “Create Sub-library”.
After naming, describing and creating a sub-library, do a long-press on any book in the library and take the option “Add to Sub-library”.
In other words, the Library/Sub-library structure seems to be quite independent of the Folder/Sub-folder structure. However, I think there’s no reason why they could not be set up to be the same, for the sake of tidiness.