Allow creation of 'Folders' and 'Sub-folders' for personal books

Are you talking about in the Personal book builder or somewhere else?

I have books covering different topics that could be nested into separate folders. Example …

1. Reformed Tradition
   1. History
   2. Doctrine
   3. Eschatology
   4. etc.

I could do this for other categories too ... say … Studies / Bible Studies / Word studies, etc.

Or say …

Dictionaries

1. Preference / type 1
2. Preference / type 2
3. etc.

I realise that in some instances, I could add tags to do a search / sort, but then the nesting facility will not work.

To expand the idea further, one might extend the concept to cover all of books in my library.

Does this help clarify the suggestion?

Tony.

like your quote and proverb.😀

You can do that now by using Favorites. In general, Logos supports the more flexible system of tagging so that a book may exist in multiple subfolders. That is also possible in the Favorites system.