Related post sort order

Could you give me more details about what you’d like to achieve?

Would you like to change the order of the 3 Related Posts displayed at the bottom of each post, so the older post is displayed first?

I would like to sort the order of the related posts to the newest instead of having the oldest post showing first. Any thoughts how to execute this?

By default, Jetpack’s Related Posts are sorted by date; they’re sorted from most related to least related; the first article appears first because it’s more similar to the original post.

You should, however, be able to use the jetpack_relatedposts_filter_filters filter to change the filters used by our algorithm to return the posts. You can learn more about the different query filters here:
https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-filtered-query.html

Here is an example on how to use the filter to apply those custom changes:
https://jetpack.com/support/related-posts/customize-related-posts/#exclude-cats