[UPDATE: This is Windows only]
There are lots of edit boxes in the Logos desktop app where you can search for books using the same syntax. But Logos is inconsistent about the grey instructional text it shows in those boxes.
In the Library it says "Find books".

In the Search tab, in the All Books dropdown, it says "Search".

In the Collections tool, it says "Rule".

In other places (e.g., Concordance tool), it also says "Search".

I suppose this isn't a huge confusion to users, but it sure makes me need to check the UI carefully before explaining how to do something to a user on the forums, because I want to make sure I get the terminology right. Am I telling them to type something into the "Search box" or the "'Find books' box"?