In order to preview the Web version of your email/template that you have just built, you need to place the mouse pointer over it and click the Preview icon in the menu that appears.
In order to preview both versions of your email/template (desktop and mobile versions), you need to open your template and click the Preview button in the top menu.
Then, you will be able to use the Preview links.
for sending the template over to your colleagues or clients for approval/to show them what your email will look like.
Please be advised: if any changes made to the very template, all the information you share with your links, will be changed automatically.