While enrolled as Instructor-student, you can take quizzes, view content, submit files to dropbox folders, etc., as if you were a student. All of your activity is recorded as if you were a student. You will not be able to see any course material that is hidden from students, including items that are restricted by date and by release condition.
This is a change that must be done via the Classlist, not the Role Switch widget. [VIDEO DEMO]