If drag a book to my quick access bar I found an option to create a folder.

When I create a folder it created a neat little navigation menu for the single book that I selected.

My thought was that I should then be able to create a list of books that I was actively reading.
I am unable to drag additional books into this folder for use.
I believe the folder would allow me to collect additional resources into a collective group (Folders).
Am I misunderstanding this functionality? Thanks in advance.
Logos 9.2 Desktop version Windows 10