Currently, when a simple search is done using reference tab in Power, Meridian does not return only documents with references.
References tab works like a filter to improve the searches, but does not work to return only documents with references.
It should be good to have this feature available to easily find the documents with references in whole vault.
Ticket reference: 01372124
I would like to mention that indeed this is not a existent feature nowadays, but I have implemnented in the past a cutom property (HasReferences) and some scripts in the event DocGenericEvent_Before/AfterCreateReference that allowed the users to perform this kind of search.