Zoom
To zoom the view, go to Diagram and click Zoom. This menu is displayed: 
Description of the illustration diagram_zoom.gif
The default zoom setting is 100%. To return to the default, select 100%.
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To zoom in or zoom out of an entire workflow: Click
and 
respectively, or set a specific percentage. -
To zoom in on a specific node or nodes: Select the node and then go to Diagram and click Zoom.
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To fit the entire workflow in the window: Select Fit to Window.