List Categories with no posts in XML Sitemap

You or your developer can use the wpseo_sitemap_exclude_empty_terms filter to customize this feature. To show all empty items (category, tags, etc), please use this code snippet.

add_filter('wpseo_sitemap_exclude_empty_terms', '__return_false');

Typically code snippets are added to your theme’s functions.php file. If you’re not familiar with using code snippets, these articles have wonderful advice:
https://www.wpbeginner.com/plugins/how-to-easily-add-custom-code-in-wordpress-without-breaking-your-site/
https://www.wpbeginner.com/beginners-guide/beginners-guide-to-pasting-snippets-from-the-web-into-wordpress/

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