WordPress Version: 6.5
/**
* Removes a sidebar from the list.
*
* @since 2.2.0
*
* @global array $wp_registered_sidebars The registered sidebars.
*
* @param string|int $sidebar_id The ID of the sidebar when it was registered.
*/
function unregister_sidebar($sidebar_id)
{
global $wp_registered_sidebars;
unset($wp_registered_sidebars[$sidebar_id]);
}