Offizieller Kommentar
@Rigakis > Unfortunately the XDJ-RX is not supported by rekordbox in PERFORMANCE mode; you must be using the software in EXPORT mode.
The search feature works exactly as you described; when in a playlist, it searches ONLY within the playlist. To search your whole collection you must select the collection on the left.
The filename is not part of the search; only the meta data is included in the search.