Once created, you can keep the pop-up modal on your website even when you want it turned off. To put it (and any module) on hold go to the last tab, Advanced and change Display field from Always to Never.
Then, when you are ready to use the module again in the future, you change the display to Always and it will be published to the website.
DISPLAY SETTINGS TAB
#1. Button to bring up pop up
#2. Automatic pop up when land on page
CLOSE BUTTON TAB
Important to choose “Yes” to ESC Keypress and Overlay Click so that the modal closes no matter where somewhere clicks.