You are currently using what we call our Third Generation Editor (or 3GE). All of the templates available within this editor are mobile responsive. You can see the desktop or mobile view when previewing the email (the button right next to save).
You can post a new message in the Community or find us on Twitter Mon-Fri 8am-8pm ET, Sat 10am-8pm ET, & Sun 10am-6pm ET. We've got real people waiting to help you out. Click below to start a conversation!