Hi, please check your website first, maybe there is a SEO plug-in.
For some users with no SEO plug-in installed — it might be built-in sitemap, a new function built in WordPress Core since version 5.5. It cannot be disable by default. It’s not “empty” — you can check it through source viewer — but it cannot be display well on some browsers. To disable it, copy code below to function.php of your theme.
remove_action( 'init', 'wp_sitemaps_get_server' );
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This reply was modified 5 years, 6 months ago by wangql.