Hiding menu during quiz

• In Story View, select all of the questions.
• In Slide Properties, select Custom for the selected slides.  This will display the default player features.
• De-select Menu.

Thanks, Judy, that did the trick!
However, I wasn't able to do it from story view, because my quiz is a random draw from a question bank. For some reason, there doesn't seem to be a way to mass-edit all quiz slides, and I've had to create the custom features one slide at a time. Am I missing something? 

Back up your file

Open the question bank in edit view then cut all the slides and paste into their own scene.

Ctl A to select all the quiz slides in Story View

Make the changes above as Judy described.

Open the question bank and import them back into the back from the scene

Delete the scene.

Thanks Wendy - might need this in screen shots as my brain can't process that! lol