Product
Layouts
Email and message layouts you edit in the console.
Layouts let you design reusable structure for delivery content in the console.
Editing
Open Layouts in the developer console to create or edit a layout. The editor is the source of truth for structure; your event payload still supplies title, body, and action fields.
Delivery
Rendered email content uses the layout system when email delivery is configured. In-app and other channels continue to use the event fields the API accepted.
Start with a simple layout, send a test from the playground, and iterate from the activity log.