On the 12 of August 2021, Google announced the release of full-screen inline ads to all AdSense publishers.
Full-screen inline ads are full-screen banner ads that show inline with your content as a user scrolls the page. They both appear below the fold in Auto ads placements and responsive ad units.
You don’t need to take any action on your account to be effective. If you have suitable ad placements, full-screen inline ads will automatically start to appear on your site.
Credit : Google