Back in the old days as you typed something into the itunes search bar the Playlist you were viewing would update to show potential matches for the search. Does Itunes still offer this feature and if so how do I turn it on/off

I mainly just want to do it because I tend to add duplicate music
(same file Itunes just doesnt see it that way since I updated the files information within Itunes)
And I want to use the search bar to find potential duplicates.

Unless someone else knows of a better way. (I would just do it by date added but a good many of these duplicates have been on my system for years.