Sitemap contains a list of accounts on a website. With WordPress 5.5 and above, WordPress gained a new feature that adds basic, extensible and fully open XML sitemaps functionality to its core. Because of this new feature, if you update to WordPress 5.5+, a new /wp-sitemap.xml is automatically created at the root of your website. And unfortunately, there is no permission that would allow you to disable the sitemap or at least exclude parts of the website from it.