When the SEO Engine is on, every new post gets a short slug in English letters: at most 6 words by default, without stop words like "a", "the" or "of". A long headline about a repo rate decision can become, for example, rbi-repo-rate-decision.
You change this in SEO Settings → URL / Permalink with Create a short SEO slug for new posts, Slug: maximum words and Leave out stop words.
The URL of a post that is already published is never changed automatically, because changing a live address breaks links that readers and search engines already have. Auto Fix only touches the slug of a post that is not published yet. If you change a published URL yourself, redirect the old address to the new one.
The campaign setting Slug Language decides whether the slug is made in English or in the language of the post title.
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