Originally Posted by danwdoo
If I have a collection on the reader with only one book in it, and I delete the book on the reader, using the reader, what effect would each setting have on everything. Calibre used to delete the empty category which is what I want. Which setting would emulate this behavior?
Calibre has no role in this scenario. When you delete a book using the reader, the reader also cleans the collections. Calibre does notice that the book went away, but nothing further is done regardless of the setting of the option.