Need to be able to search by folder in explorer in Rekordbox

I am a wedding DJ and I have a lot of songs nicely organized by Gender/Year in folders and sub-folders. Of course, I have my preferred songs organized in Playlists which is just a small subset of my entire music library and what I mostly play at weddings or events. However, many times they ask me for a song that I have not added to any of my playlists but I know I have it in one of those folders in explorer. Why isn't there a search Box to search by Folder in Explorer?
It is not my intention to add all my thousands of songs into the Collection if that is what you are going to say: Add all my music library to Collection and then search there.

In short: I have just a small subset of my music in my Playlists. But should be able find any songs by searching in Explorer folders in case I don't have that song in my playlists but it is somewhere in my Explorer folders.