Need help accessing Codeigniter's sitemap?

I'm unfamiliar with Codeigniter 3, and I'm currently attempting to access the sitemap.xml file. Could someone kindly assist me?

I've attempted to access it using both a .htaccess file and by utilizing the controller and routes. When using the .htaccess file, I encountered a 404 error. On the other hand, when utilizing the MVC approach, it only generates URLs for a specific section.