Present Mode is a great tool when you are doing an in-person presentation. It minimizes the comment panel and lets you use the arrow keys on your keyboard to flip between comments.
Simply click on the "Present" button on the top right corner of your screen.
Then click the ">>" button to minimize this window.
Now you can start to enjoy the full screen presentation. Use your up and down arrow key to move between comments, when there is an attachment, it will show up a thumbnail at the bottom right corner of the screen. Use the left and right arrow key to open and close this attachment.
You can also click the up and down arrow on the screen to flip between comments, and click on the thumbnail to open the attachment.
Project courtesy of Link-Arc, check out their work at Modelo Blog.
Video tutorial, scroll to 02:35