You can toggle on large document previews so you can view student work quickly. This can be useful if you're looking to provide feedback on-the-fly! Start by going into the Shared Items:
Look for the "..." icon at the top right corner
A toggle will appear for Show Large Previews
Toggle this setting on
Once turned on, you'll be able to see supported documents in a larger format.
If the document has multiple pages, you can navigate through them by swiping left/right or using the left/right arrows on the web app! You can also toggle this on anywhere including the Class Discussion, Groups, and Student Portfolios as well as student assignment folders.