Publishers: Google AdSense Launches Ad Balance To Focus On Your Best-Performing Ads

Google on Friday, January 13, 2017 introduced a new tools in the new Google AdSense user interface named "Ad balance." Ad balance lets publishers use a slider to reduce the number of ads show to users, specifically the ads that earn you the least revenue, and see how it affects your earnings. It also helps to balance between the number of ads you show and the user experience on your site which can lead to better overall engagement with your content.

Google further explain that "you’re able to see how changes in the volume of ads you show affect your earnings, and find the balance that makes the most sense for you and your users. By only showing your best-performing ads, you may see a minimal drop in your earnings. However, these changes may result in an overall earnings increase, since an improvement of the user experience often leads to users staying longer on your site and engaging with more of your content"
Here is a screen shot of the Ad balance:
Google Adsense Ad Balance
You can drag and click apply to adjust your ad balance:
Google Adsense Ad Balance
How To Use Google Adsense Ad Balance Slider

The new Google AdSense Ad balance is easy to use, just follow the below guide on how you can setup yours
    Sign in to Your Google adsense account and check the left navigation panel.

    Click ‘My Ads’ section.

    Click on ‘Ad Balance’.

    You will get a slider interface to regulate number of ads display.

    A Second slider will show the impact due to changed Ad Balance Settings on your earnings.

    That’s it. 
With your desired value and analysis, you can apply the changes. You can also read further on the Google official Adsense blog Here