Zoom

Select Diagram > Zoom. This menu is displayed: zoom menu

To zoom the entire workflow in or out, click either zoom out
or Zoom in
or set a specific percent. To zoom a specific node or nodes, select the node or nodes before you select Diagram > Zoom; the selected nodes are zoomed so that they fit into the window.

Select Fit to Window to fit the entire workflow in the window.

The default amount of zoom is 100% to return to the default, select 100%.