Visit https://www.google.com/webmasters/tools/ad-experience-unverified
In the left-hand panel, under “Ad Experience,” select Desktop or Mobile to view the Report for each environment.
If you have more than one site property verified with Search Console, select the one whose ad experiences you want to view.
You can also access it from your Google Search console by navigating to the “Old version” at the bottom left of the screen and then navigating to “Web Tools.