Meta & Search Engine Result Page
All meta information and SERP (Search Engine Result Page) is available for customization in SEO -> Search Engine Results Page.
The most important one to set is the "default". It will automatically fill in for any missing meta information. For products, services, and blog posts, this information automatically generates as shown in the Alerts.
To make it easier to understand, you get a preview of your meta description for search engines and social media shares.