Google is testing a new query refinement ad option, displaying related search queries under a sponsored card-based ad carousel in search results.
This feature aims to provide users with additional relevant search terms linked to the ads they see, potentially enhancing ad engagement and user experience.
Similar test for query refinement was seen in June, but it was using the top search bar filtering for refinement.
To learn more, read the article here: Google Ads Query Refinements Under Ad Carousel