The three main criteria for optimising a page layout for a certain screen size are: Now the recommendation is a responsive website template. It should still look good and work well at all sizes, which is why I * used to* recommend a highly accessible liquid layout using percentage widths to control layout. Monitor Google Search Console mobile-friendly and usability alerts.
Use a liquid or responsive layout that transforms to the current user’s window size. Screen sizes and browser window state vary among visitors. Websites should transform responsively and fast at all screen resolutions on different browsers and platforms. There’s no one best screen size to design for. External links to third party sites are moderated by me. There is no third party advertising on this page or monetised links of any sort. Disclosure: “ This article is personal opinion of research based on my experience of almost 20 years.