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For me on the android app the + works. It shows what looks like a complete list of all offline songs...
Again ,not a solution but a workaround.
Consider voting for this feature here.
Without the required votes it will never make it.
This is not possible on a desktop in the current UI. 😭
You can put all your playlists into a folder and play that 🤓🔥
Interesting how the Desktop app and Android app are so different....