1) Create an empty playlist.
2) Play the empty playlist you just created by right-click the empty playlist, then selecting “Choose as current playlist.”
3) Highlight and delete any songs that are still in your Play Queue and you should be left with an empty queue.
Suggested method clears all but 1 song in queue. Can’t right click and delete that song since delete button is grayed out. So pick another playlist start playing last song then click on skip button to finally clear queue of ALL songs.
Thanks, Andrew!