If you use a PC - hold the ctrl button down and roll the scroll wheel on the mouse, or press the + key. Pressing the - key while holding the ctrl button down will reduce the size. Holding the ctrl button down and pressing the zero key: 0, will return your screen to it's original size.
The fox, a mere 92 yards is actually not a difficult target. Due to the 'glow' of the paint, most people think it's a coyote - It's about 50% smaller than a coyote should be.
Even if you use the scroll wheel on the mouse to increase or decrease the picture/page size, holding the ctrl button and pressing the 0 key will return the page to it's proper size.