Once the design of your template is done, you can use the preview option to have a visual presentation on how the email is going to be displayed on your customer’s end. You can preview your template on Desktop, Mobile and Tablet modes.

Once you have selected the style of the template you are going to use for the campaign, you will be directed to the design tab where you will have the options to edit the template. Once the designing is done, at the top right corner you will be able to see the preview icon.  

On clicking the Preview icon, it will show you the preview of your template in desktop view mode by default. You can switch to the mobile view mode by clicking on the mobile icon provided.     

In 'Review' step:

The campaign you created can be previewed on the final step before sending. The template can be previewed on Desktop, Mobile and Tablet.