I had the same issue. I didn't see a blue dot either, but what you do is go to the last song in your queue and hit play and the songs above it will disappear. In my case, I had 100s of songs queued so I had to go back to the bottom of the list to clear the songs above it.
Playing the last song doesn't work if you're playing a Playlist - the queue just fills up again with songs from the Playlist. However, if you add an album to the queue, and then play the last song on the queue, the queue will clear.
Tidal lets you manage the queue in a common-sense manner, and the best sound quality option definitely sounds better than Spotify. Tidal has greatly expanded their catalog recently. But Tidal has occasional server errors which can be awkward with guests; the Spotify servers and Spotify Connect are rock solid. I subscribe to both.