TL;DR: The ability for users to hide the grading, comments, and files area so documents can be viewed in full screen when grading in the Teacher App.
The Teacher app currently doesn't give the ability to hide the grading, comments, and files area when using the app on an iPad in landscape or portrait mode. It would be helpful to temporarily hide this section so the user can have full-screen access to documents in SpeedGrader for annotations.
This is a current view on an iPad in portrait mode:
This view limits the usability of SpeedGrader, especially for annotations.