Remove parent theme action in child

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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 );
}

Read about remove_action

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