Have you prepared your music on the USB drive using Rekordbox?
The sorting options active
Hello, I can not use the sorting options active on my cdj 350. How?
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Then you simply need to prepare your drive for the various sort options available.
Watch this video from around the 4:10 mark.
Looks like the link broke - that post was from 5 years ago and the updated software might have removed the link. Try here, the whole video -- it's from an OLD version of rekordbox but those steps haven't changed.