Hide Coupon Field

woo_hide_coupon.php

<?php
// Hide coupon field 
function hide_coupon_field( $enabled ) {
	if ( is_cart() ) {
		$enabled = false;
	}
  
	return $enabled;
}
add_filter( 'woocommerce_coupons_enabled', 'hide_coupon_field' );

// hide coupon field on checkout page
function hide_coupon_field_on_checkout( $enabled ) {
	if ( is_checkout() ) {
		$enabled = false;
	}
	return $enabled;
}
add_filter( 'woocommerce_coupons_enabled', 'hide_coupon_field_on_checkout' );