How Message Editing Works
When you open a message to edit, the system maintains the active message while you edit a copy on the message window. Your changes are not committed until you deploy and save them. This prevents any disruption in automatic notifications and emails during the editing process.
Because you are making edits to a copy of your message, the active content on your site is not affected until you are confident in your changes and ready to deploy them. In case you make any accidental changes while editing, you can restore your message by reverting to the original system default message at any time.
You can also view your active content so that you can copy and paste it into the version you are working on. For instance, suppose you have made changes to your edited version and then want to go back to some of the elements used in your active version. This feature lets you see a read-only version of the active content that you can copy and paste into your working message.