You can use the + or – to zoom in and out or you can use the wheel on your mouse.  In the upper left corner is a small square to the left of Florida National Cemetery Section Map.  If you click on that you can search for a Section, or location by scrolling up and down.  

To view in full screen just click the symbol in the top, right side of the map and a full screen view will appear in a new window.  When done just close that window.