On the right hand side of your window is a panoramic view of the area you selected on the left. It takes a moment to appear, and once it does you will see it start to pan around to give you a virtual view of the area.
At any time, you can click on the picture to stop the panning. Below are some other features you can use:
Hold down the Shift key and click on the image to zoom in
Hold down the Ctrl key and click on the image to zoom out
Click on the image and hold down the mouse button: you can manually pan left-right-up-down
To begin the automatic panning, refresh your screen