Premium Feature: Newsletter Signup Exit-Intent
From there, click on the blue "Customize Popup" link and you'll see a menu of options on your left. This menu will allow you to fully customize the Newsletter popup, including the Premium-only options to take exit intent and frequency limits into consideration. The exit-intent tool allows you to show your popup to users who are in the process of leaving your website.
For more information on Premium Features, check out this article on everything Swell Premium has to offer!