The XML Sitemap extension can automatically generate a sitemap out of the various sections and contents of your WordPress blog. If you want to remove a particular section of your website from the sitemap, follow the below procedure:
Connect to the WordPress dashboard.
Go to Settings > XML- Sitemap.
Scroll to the Sitemap Content section.
Uncheck the items you want to remove from the sitemap:
Scroll down to the bottom of the window and click on Update Options.