Google is testing a new dotted underline format for sitelink assets in Search ads on mobile devices, as spotted by Khushal Bherwani. The updated styling gives sitelinks a distinct look and could help draw more attention to additional landing pages within paid search ads.
Hana Kobzová spotted another variation of the same experiment, where Google adds a Top pages label before the sitelink row.
Both layouts suggest Google is exploring new ways to make sitelink assets more prominent and easier to navigate.