CC does behave differently from calibre. Tapping on a group (a category) returns all books sorted by the auto-sort of that category. The effect: the empty value is returned like any other category so all books are shown.
I interpret your question as saying that you want to see all values that are not empty, ln that case, long press on the <<>> line and select "Not matching". Then tap the group/category again. You will see only the items that actually are in #manual.
I am open to changing CC to return only non-empty values if the CC setting "Show empty values in groups" is unchecked. My problem is that this would be a rather significant change in behavior. I need to be convinced that the large majority of other users would accept the change before I can make it.
|