We're sorry to hear that you don't see your queue anymore. It's possible that some of the app files have gotten corrupted and are causing the app to malfunction. We suggest you run a clean reinstall since this step can usually solve issues similar to what you're describing. You can find the necessary steps here.
If that doesn't fix things, could you send us a screenshot of what you see at your end? You can attach it via the post editor, just make sure to hide any personal info. We'd also appreciate it if you include the Spotify version you're running.
Keep us posted! We'll be happy to lend a hand if you need more help.
Help others find this answer and click "Accept as Solution".
If you appreciate an answer, maybe give it a Like.