Select Multiple View (top right) to view documents side by side.
Each document is displayed in a compact format. Depending on what you were viewing, you will see the overview panel or the full-text for that document. You can flip between views, using the Overview or Full-Text button.
To navigate through your open cases, use All Open Documents and the arrows in the top right corner.
To return to one document, click Single View. You can still navigate between documents using the All Open Documents button and the arrows in the top right corner.