When building or viewing a flow, you can easily adjust the zoom magnitude of the flow canvas. To zoom in or out from the default view setting:
Click the Select button on the tool palette.
Right-click a blank area of the flow canvas, and then click Zoom In, Zoom Out, or Fit to Window in the shortcut menu.
For the Zoom In and Zoom Out options, repeat the above step if you want to zoom further in or out.