Change submit from a check mark to a Submit button for quiz questions

Hello Bonnie.  I used to work for Fidelity!

My users also hate the built in submit button in the modern player so I turn it off on my quiz slides and add a button with a trigger.

Step one: Add a button.  "Insert" --> "Button". Label it "Submit" 
StoryLine will add an empty trigger in your trigger panel.
Click the Add trigger link that StoryLine provides.
In the "Action" drop down, select "Submit Interaction"
In the Interaction drop down, choose the current question
In the When field, select when "User clicks"
In the object field, select your new button.

Place it on the slide where it makes the most sense.  For me, that is typically the bottom right hand corner.

PS.  I've yet to have anyone complain about the "navigation changing" because they expect that quizzes are different than regular content slides.