As I said previously I find it all a bit confusing. When I first used Find Duplicates a couple of years ago, to see the excluded books I would select its Show all book duplicate exemptions and it would do a search for marked:not_book_duplicate
When Virtual Libraries were implemented that search 'ended up' as an Virtual Library Additional Restriction - even though the current library had no Virtual Libraries
To bring the issue to kiwidudes attention I'll post a link to this thread in the Find Duplicates PI thread.
BR
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