There seems to be very limited documentation on this feature on the docs
docs.microsoft.com/.../access-preview-feature
Career site – The current version of the career site just lists all open jobs. However, more capabilities will be added to the site in the future. Jobs can be marked as either internal or external. Internal users who sign in to the site will see both internal jobs and external jobs. However, non-internal users and users who aren't signed in will see only external jobs.
I would love to read more about this feature, are there any blogs from people who have used this or video tutorials anywhere?