What’s unclear from this screen-shot though is, what Type is this a Set of?
I too have observed some problems with filtered views.
But in order to have objects appear here, they should meet both
the Type criteria of the Set (for example Book)
what’s being queried in the Filter
The latter, in your case, is the name “relation”.
You didn’t actually select the pre-installed Type “Relation” because the R isn’t capitalized. It seems you have entered in your own custom Type called “relation”, and maybe created it inline during the search?
Either way, it won’t appear here if there aren’t any Objects of the particular Type this is a Set of.
These filters are useful with relational sets. The query I’m suing is the object type relation so all object show up in sets including relations, relation options and templates. That’s why I want to filter them out since I usually don’t want these to be shown in my sets.
The capitalization doesn’t matter, I’ve tried both for all 3 types.
edit: I did this screenshot in a hurry, just to show you a quick example.
These still don’t seem to show up in the newest beta version. I tried making a set of sets that all have a specific relation in their set of relation, but only types showed up in the filter search menu.