Sonos does not sort any music lists. Some music services allow their lists to be sorted differently (Groove did, may it RIP). If you would like Spotify to add the option to sort their playlists, you need to ask Spotify to add that option (by adding a dummy item to the top of each playlist enumeration, a bit like the "Play All" dummy item that some add).

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thanks! On Spotify app there is that option, why do you say we should ask to spotify? I think it is something that sonos should implement in their app.....

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