You have 2 types of views to check your unfiled documents. By default you will see a List view. To change it, just click in the icon "Grid view" next to the "List view". 

1. List view - All your unfiled documents will be in a list with the document name, date, and sender's email address. Next to the list you will have a gray area where the document preview will be display if is permitted.    

2. Grid view - All your unfiled documents will display with a small preview. You will see the name of the document, date and the sender's email address. If you want to see a large preview, hover over the small document preview and a blue magnifying glass will appear, click on it.