Google Search is testing placing a title above the sitelinks for the sponsored results, the title says "more from [advertiser name goes here]." I think it makes it super clear where these sponsored links go to, but it may be a bit overkill.
This was spotted by Sachin Patel who posted a screenshot of this both on X and SEW - here is what it looks like:
It also includes the advertiser's favicon and name, which is a win for advertisers.
I do not see this myself, so it is a limited test.
Forum discussion at X.
