The Campaign Editor lets you create your designs in two views: Desktop Newsletter and Mobile Newsletter. These options enable you to check how your newsletter looks as viewed from a desktop computer or a mobile phone. You can switch back and forth between the two views at any time so that you can make the necessary adjustments and refine your design.
Desktop Newsletter view
The Desktop Newsletter view is the default view when you open the Campaign Editor. On the top menu, click 
to switch to this view.
Mobile Newsletter view
The Mobile Newsletter view allows you to edit the mobile version of your newsletter, without affecting the desktop version. To switch to this view, click 
.