The interface design choices suggest that you have to filter by type or property and that you cannot change this.
I don’t understand this choice, which misleads a lot of people, because that’s not actually the case.
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You can create a query with ALL your objects : there is no “all” option, but filtering on a property that all objects have also works. Filter on property = Creation date and you will get everything.
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You can change your query when you want, without delete it. Simply go again where you have choose your query filtrer and click the cross :
For your need :
- Into your Book type, add an “Author” property : Object, limited to “People” type)
- Create a query with Select query “Property = Author” and filter by “Backlinks is not empty”
It works only if you links people onlyt to books.
Actually, we need this FR to do something more efficient : Automatic Bi-directional linking + Rollups
Or you can add a tag to each “People” with “Author”, “Actor”, Family" or what you want.

