The Layout tab, like the Tree tab, is a view of a flow service that Designer displays in the flow service editor. You can use either page to build or edit a flow service. However, Layout tab provides a more graphical view in which to create flow services.

In the Layout tab, a flow service looks similar to a flow chart. Designer displays shapes for flow steps as well as for the start and end of the flow service. Lines connect the flow steps and show the order in which the flow steps execute.