In an official blogpost Google announced about rolling out the “Landing Pages” page. This will help advertisers see how their lading page are performin. “Landing Pages” will be rolled out over the coming weeks in the new AdWords Experience. The new page will show which URLs in your account are mobile-friendly, which ones drive the most sales, and which one need attention.
“Mobile-friendly Click Rate” shows the percentage of mobile clicks that go to a mobile friendly page, that meets the guidelines of Google’s Mobile-friendly test. This metric shows which landing pages result in the most or least mobile-friendly experiences. To learn more visit Google help document.