Remove the state field from both shipping and billing details section

wc_remove_shipping_billing_state.php

<?php

add_filter( 'woocommerce_billing_fields', 'wc_remove_shipping_billing_state' );
add_filter( 'woocommerce_shipping_fields', 'wc_remove_shipping_billing_state' );
 
function wc_remove_shipping_billing_state( $fields ) {
	unset( $fields[ 'billing_state' ] );
	unset( $fields[ 'shipping_state' ] );
	return $fields;
}