I don't recall there being a duplicate-finder, did you perhaps mean this:

That only appears when you try and add a song to a playlist twice.
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In the older RB versions there was a function to filter/select the double tracks in your collection. I can't seem to find this function in the new rekordbox? Is there any way to solve this?
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I don't recall there being a duplicate-finder, did you perhaps mean this:

That only appears when you try and add a song to a playlist twice.