OK thanks for the tips. It seems to be working correctly now.
Turns out that I had to set the filter to Books, with sort set to Collections, to get what I want: all the books added to collections disappear, leaving only the solo books.
The Books filter logically left only the books, but inexplicably "sorting" by Collection doesn't sort by anything, but instead filters out all the categorized books, and the collections appear in their place. Followed by orphan books.
I have no idea why the sort option does that, but it works fine now!
Filter: Books
Sort: Collections
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