You are not understanding what I just said.
Your quiz is not connected in your course curriculum. Check your course curriculum there is no quiz.
Add the quiz in course curriculum and after that when a user will finish the quiz then you will be able to see the quiz in quiz submission.
You're right. I didn't understand what you were saying. I have re-read the WPLMS documentation and worked out what I needed to do. I have added the Quiz as part of the Curriculum within the Course edit section.
I can now see the drop-down screen and can see those students who have completed the quiz.
Thank you for your assistance with this issue, and my lack of being able to follow instructions!
Thanks for confirming, that the issue is resolved.
So marking the topic as resolved and closing the topic.