There are two ways to customize the metatags for your custom domain. You can use the domain configuration:

 

 

By filling in the Favicon, Title, Description and Image fields you can customize how the custom domain is previews in search and socials.
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Advanced
If you like more control, you can add advanced rules and then select Metatags. You can then fill in the fields:
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- Source is on what pages you would like to use the metatags. A source * will preview it on all pages, while /test will only preview it on the test page.
- Site name, site title and site description are use to customize the metatags for name, title and description.
- Seo title and seo description are used to customize the og metatags
- Site image is used to customize the preview and the favicon is used to customize the favicon