Today’s episode’s playlist had already begun, automatically. Failing to notice this, I started a fresh playlist for today’s episode. Then I saw what I had done, and of course wanted to undo it. My humble exploration of options does not seem to yield any way to do this.
(I am deliberately using the words “today’s episode” in this post because the word “playlist” by itself seems to mean the design for all episodes of a regular daily or weekly show.)