To improve and enhance users’ working experience, Windows ... a library folder, right-click on the library folder and select Delete. Libraries are where you go to manage your documents, music ...

For your information, if you use this option, the template of all Library folders (Documents, Music, Videos ... To use this option in Windows 10, open a Library folder, click on the View menu ...

Head back to your music library, and you should now see your playlists being added. In case you're still using the iTunes app ...