Hide Coupon notice form in Woocommerce checkout page

Solution:1

You can use a custom function hooked in woocommerce_before_checkout_form action hook that will remove the notice coupon form without disabling coupon functionality in checkout page:

add_action( 'woocommerce_before_checkout_form', 'remove_checkout_coupon_form', 9 );
function remove_checkout_coupon_form(){
    remove_action( 'woocommerce_before_checkout_form', 'woocommerce_checkout_coupon_form', 10 );
}

Code goes in function.php file of the active child theme (or active theme).

Tested and works.

Solution:2

This tag seems not having an unique id/class assigned. But something like this should be able to do it:

$(".showcoupon").closest(".woocommerce-info").hide();