How do I preview a project in the Calendar?

To preview a campaign project in the Calendar, you must click on the particular project you wish to view in the specific date box within the Calendar.

Once you click on the project, a sidebar will pop out on the right-hand side of your screen and an option to preview the campaign will appear. When you click Preview, you will then have the option to simulate the sending of the campaign by testing it with lists. The merge tags are filled out during the test, however, it doesn't actually edit the campaign in any way.