Using WordPress ‘remove_option_whitelist()’ PHP function
Removes a list of options from the allowed options list.
WordPress
Using WordPress ‘remove_image_size()’ PHP function
Learn how to use the WordPress'remove_image_size()' function to remove unused or unwanted image sizes in your website
Using WordPress ‘remove_editor_styles()’ PHP function
Learn how to remove visual editor styles using the WordPress'remove_editor_styles' PHP function in this informative article
Using WordPress ‘remove_all_filters()’ PHP function
Removes all of the callback functions from a filter hook.