For better viewing use the buttons at the bottom left of the panorama player window:
1) To view the widest angle (recommended) move the 1st button, the "Zoom" slider, all the way to the left to the minus sign (-).
2) If the panorama is not already rotating toggle the 2nd button for "Automatic Rotation".
3) To view it in full screen mode click the 3rd button for "Fullscreen" (when done press escape to return).
Note: You can also click and hold down your mouse to move wherever you want and click "Auto Rotation" to reset and rotate again.