To zoom the display, press the Zoom In button. Each press gives you a closer look at the subject. A thumbnail appears in the lower-right corner of the screen, as shown here, with the yellow highlight box indicating the area that's being magnified. Press the Multi Selector to scroll the display if needed.
To reduce the magnification level, press the Zoom Out button. If you're not using Subject-tracking mode, you also can press OK to return to normal magnification.