Use magnifier

When the mouse shape becomes a magnifier , it means magnifier is ready to use. Press and hold down the left mouse button, the image will be enlarged in the magnifier. Dragging the mouse (keeping the left mouse button down and moving the mouse around) will move the magnifier across the image. The view depends on Magnifier Settings - zoom ratio and magnifier size. There are 4 magnifier zoom ratio options: 1.5, 2.0, 3.0 and 4.0. There are 8 magnifier size options: 100, 150, 200, 300, 400, 500, 550 and full. The full option uses the full screen as a big magnifier.

Please note that, when the image is zoomed-in (See Zoom in and Zoom out) and its displaying size is larger than the screen, the mouse will become a hand shape . Now the magnifier is not useable since the mouse is used to drag and move the image. To enable magnifier, press Space key or select Best fit in Zoom Ratio menu.