I had a look at the news page (kagi.com/news) and the first news item had two reddit links as the top sources - I don't want that. Reporting this as a bug rather than feature request because I do consider it a bug that the news page doesn't have the same ability to tune what sites are prioritised/blocked as the search itself does.
Something like a three-dot menu would be next to each source with a popup similar to what appears on normal search results.