A workflow may consist of multiple stages. To view or edit these stages, you need to edit the workflow definition and make changes. The Stages section lists all stages within the workflow definitions allowing you to view, edit, delete, unpublish, or publish the staged flow.
You cannot edit or delete out-of-the-box (OOTB) staged flows.
You can view, edit, or delete a stage in the same way as a workflow definition. For more information, see Working with Workflow Definitions.