The principle of mobile-first indexing should no longer be a new concept to anyone. Accordingly, a separate report is also provided for this within the Google Search Console. The tab Behaviour of pages gives an overview of how well the URLs have been optimised for mobile use in their entirety. The data is collected for both mobile and desktop devices. From this page you can also navigate to the tabs Core Web Vitals and User friendliness on mobile devices. There you will find which values do not meet the criteria and need to be optimised or where the user cannot interact optimally with the user interface due to the layout.