I liked this solution:
For removing an action hook you should use the same action name, callback name and the priority that was used to add a action in parent theme. And register it on init
add_action( ‘init’, ‘remove_my_action’);
function remove_my_action() {
remove_action( ‘woocommerce_before_shop_loop’,’storefront_sorting_wrapper’,9 );
}
So, if you need to remove a specific action on WordPress, that’s how you do it.