This isn’t something you can configure, but rather we infer it based on the metadata available when the stack(s) were last updated. Specifically, when the stack is updated we check if it is inside of a git repo, aid if the origin matches something well-known like a prototypical GitHub repo, then we put in the link.
(If you find this helpful, we can certainly tweak the feature here and/or improve it. So your feedback would be useful.)
If you DM me the specific stack that isn’t showing any data (e.g.
you/project-name/stack-name
), I can look into perhaps explaining why it isn’t in that case. (The most common situation is for a newly created stack which has never been updated.)