When you press Next: Content with Drag and Drop Builder selected and no design attached yet, Sprwt saves your wizard entries, creates the design (blank, or a copy of the template you picked, named after the campaign) and opens the designer. The designer's top bar shows Back to Campaign; clicking it returns you to the wizard at the Review and Confirm step with everything you typed restored and the design attached. From the Content or Review step you can go back into the designer at any time with Edit template / Edit Design, and Preview opens the rendered email in a new tab. If something goes wrong creating the design you are returned to the wizard with Error Creating Template! or Invalid Template!.