Google adsense announcing a new ad format called side rails.
With these ads you can increase adsense revenue
Side rails ads are stick to the sides of your web-pages when they're viewed on widescreen
For this ads, you have to go to the ads setting and open it.
If you have alredy turned on anchor, side rails will start automatically
Side ad rails start to appear on site after 13 December 2022
If you'd prefer not to show side rails, turn off this option in your ads settings.