When you add/remove some of the music to/from your Lightning Server Storage (USB drive/Network Share Folder), you have to 'Rescan' your Lightning Server to enable these changes. If you forget how to setup your Lightning Server, or if you want to use a new storage rather than to keep your old Lightning Server index data, please refer to this article:
How to Setup Lightning Server in the Lightning DS App
Please just simply go
Side Menu > Settings > Music Library > Select your Lightning Server
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