It’s not related to our theme. Page that you are talking about is the WordPress post author page.
You may try the solution from the Yoast plugin https://kb.yoast.com/kb/how-to-exclude-author-pages-from-sitemap/
SEO services are outside the scope of our support. You can submit SEO optimization request to the WPKraken team if you don’t have the necessary skills and don’t want to read posts that we provided and prefer to get third-party help with this.