What it is
A fixed-width layout that does not adapt to the screen fails on mobile, and Google indexes mobile-first. A responsive layout is a baseline requirement now. Not mobile-responsive. Mobile usability failure under mobile-first indexing. Implement responsive design. Medium-high. Direct.
Why does non-responsive/fixed-width layout matter for AI search?
Mobile usability failure under mobile-first indexing.
How do you fix it?
Implement responsive design.
How do you find it on your site?
- Test the page across mobile, tablet and desktop widths.
- Confirm a viewport meta tag and responsive CSS are present.
- Fix fixed-width containers and overflow.
- Re-test mobile usability in Search Console.
Which ranking and citation factors does it touch?
Mobile usability is central to a mobile-first index. A non-responsive layout fails real users and rankings.
What is the impact?
Medium-high. Direct.
What is the evidence?
Mobile-friendliness matters (mobile-first). Google Search Central, Mobile-first indexing best practices; Google Search Central, Understanding page experience in Google Search results
Sources
Frequently asked questions about non-responsive/fixed-width layout
What does "Non-responsive/fixed-width layout" mean?
Not mobile-responsive.
How do you fix non-responsive/fixed-width layout?
Implement responsive design.