Google is testing a new ad groups interface for the Google Ads Search campaigns console. This seems to be a simpler interface with fewer options than the current version.
This was spotted by Zeeshan Ali, who posted the screenshots below on LinkedIn:
Hana Kobzová posted about it on PPC News Feed and explained "Google is testing a revamped ad group creation interface in Search campaigns, mirroring the visual structure already used in Demand Gen."
Forum discussion at LinkedIn.