Zoom This feature is only available when the Allow Zoom box is checked. Click the Zoom Graph In button (the magnifying glass icon with the plus sign in the center) or the Zoom Graph Out button (the magnifying glass icon with the minus sign in the center) to expand or narrow down the scale of the graph. For example, if the value in the Zoom Percent box is 10, the Zoom In / Zoom Out buttons will enlarge or shrink the graph by ten percent each time you click the button. Click the Reset Zoom button to reset the Zoom Percent box to its original value. To zoom in on a particular section of the graph, you can also click and drag inside the graph to select a range of data points. The selected values expand to fill the graph area.