The sitemap.xml file is where all the URLs of your website that you want to get indexed are listed. Sitemaps help search engine robots find and index your website pages faster. Optimizing the sitemap to prevent the indexing of undesired URLS by search engines is always a smart idea.
Yoast SEO plugin has the option to prevent the indexing of undesired URLS, uncheck " Show author archives in search results " and click " Save changes "
