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A New Quizzes quiz will only show the first 50 questions if taken in Respondus.
Regardless of the browser being used all questions should be visible.
Create a New Quizzes quiz with more than 50 questions
As a student, navigate to the course and then the 'Assignment' tab
Select the quiz and in the alert that appears, click the option to open respondus
Take the quiz
Notice you'll only see the first 50 questions