The Autopilot feature uses a search algorithm that's based on semantic search to optimize relevance of the recommendation.
Only one recommendation appears at a time.
The priority level assigned to a recommendation set decides which article appears first.
If multiple recommendation sets have the same priority level, then the recommendation set that was most recently synced hass higher priority.
There is functionality that lets you source content from a public website. However, be aware that websites containing a lot of rich content or complex formatting may not reproduce exactly as expected.
If you want to remove an article from being visible to your users, set that article to Draft to unpublish it.