For example, the original URL would be
What I want is
http://localhost/sub_category/, furthermore, I want to add an endpoint to the URL which looks like
I've removed the "category" from the URL successfully by following this tutorial https://jonnyjordan.com/blog/how-to-remove-category-from-your-urls-in-wordpress/ .
But once I remove the "category" from the url, the
add_rewrite_endpoint( 'endpoint', EP_CATEGORIES ) won't work…