Google is testing a larger sitelinks layout block design again. Google tested tons and tons of sitelinks formats over the years including this one. It began testing this look again a few months ago but the tests seem to be increasing, maybe we will see this new look rollout soon?
Here are some screenshots of this that I found on Twitter over the past couple of months, I am sorry if you sent me examples over the last week or month and yours is not included below. I know tons of you sent me examples.
Here is what the new version looks like (click to enlarge):
Here is the normal version (click to enlarge):
Here are more examples:
— Saijo George (@SaijoGeorge) July 12, 2021
