(2) The controls are at the lower left of the screen. If they are not present, click on the silver arrow at the bottom left of the screen. Then, to see the image full screen, click on the left blue button with the (X) on it.
(3) Move around by clicking and dragging with the mouse. Zoom in and out with the Control and Shift keys.
(4) To get back to the little screen, click on the (X) button again.