Primo searches for Network Zone participating libraries can be configured to include NZ-linked records that are not held by a user's home library/institution. In these types of searches, non-available content is often ranked above available content (see "problematic ranking" screenshot). Users can use facets and/or different search profiles to just see what is available at their home library. We'd like for there to be something of a compromise between these two extremes (getting buried in non-available content vs only seeing available content). It would be something akin to the "Library" sort available to WorldCat Discovery users, where available content would be ranked more heavily and float to the top, but non-available content would still be present in search results just in case there is not much held content that is relevant. I see this being a sort option that users can select, but I would also happily accept a configuration setting that applies this sorting logic for all searches at an institution.
In the"wc ranking" screenshot, you can see one approach to solve this: a "Library" sort option which floats held content to the top but doesn't exclude non-held content altogether (non-held content of equal search relevance is simply ranked lower). The Ex Libris solution to this doesn't have to be a copy of what WorldCat does, this is just one illustration of how to approach this problem.