Clicking "View As Student" in Canvas is intended to show you an activity or course as the student will see it. However, when viewing a TeacherMade assignment, you'll notice that the "Submit" button reads "Get My Score" and there is a banner across the Activity that tells you you're viewing a "Teacher Preview" of your Activity.

That's nothing to worry about! We show you the preview so that you can test the Activity and make sure it works the way you want. The students will see the normal "Submit" button, and only have the tools you have turned on in the course of creating the assignment.