Suppose you have a notes file with lots of notes in it, attached to various Scripture references, in random order, and you want to find all the notes in it that are attached to the book of Ephesians. It would be nice if you could press Ctrl+F and type in Eph and filter the notes file to show just those notes. Currently you cannot. Ctrl+F will only find content text and title text, not Scripture reference text.
Actually, to make this feature work properly, it would need to be able to parse Scripture references completely so you could filter the notes to show only those related to Eph 3-4, for example. And you might need some way to know whether the user meant Logos to take the text they were typing in as text (i.e., only show me notes that mention this text) or as references.