Google is testing out a new format for its Sitelinks. Whereas previously the Ads results would show up to four sentences across two rows, we are now seeing three Sitelinks, each with a row on its own.
Below is a screenshot of what I am seeing for some search results this morning:
The Sitelinks remain the same in the back end of Google Ads, with up to 25 characters for the header and two descriptions of up to 35 characters each. However, I am only seeing one description beneath the headers in the new format.
This additional space taken up by the top search result should help increase the click-through rate of your ad, and increase the importance of using sitelinks.