Good morning, @HGHaskell ...
This is interesting. I've never seen that behavior before. So, I searched through some of the Canvas Guides, and I think I found an answer for you: How do I view the details of a submission for a st... - Canvas Community. The last section in this Guide, "See All Quiz Attempts", states the following:
If a quiz includes more than 65 total submissions, individual attempts cannot be viewed in SpeedGrader. To view prior quiz attempts for a specific student, click the See all quiz attempts link.
Do you happen to have more than 65 total submissions for that particular quiz? If so, that's why. If not, then it might be best to contact the Canvas Help Desk folks to see what other things might be causing you to see the link instead of the drop-down menu. How do I contact Canvas Support? - Canvas Community
I hope this helps a bit. Let Community members know if you have any other questions about this...thanks! Take care...be well.
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