In Minitab, there are three ways to zoom worksheets and graphs. To zoom the worksheet, click the worksheet in the data pane; to zoom a graph, click the graph in the output pane. Then, do any of the following:
Go to View > Zoom. You can select one of the given sizes or specify your own. The minimum value is 50% and the maximum value is 400%.
Hold the control key and scroll the mouse wheel. By default, scrolling the mouse wheel down will zoom out, and scrolling up will zoom in.
Use the zoom slider in the lower right corner of Minitab.