Checkout page customize

functions.php

// Make postal code optional
add_filter( 'woocommerce_default_address_fields', 'customize_extra_fields', 1000, 1 );
function customize_extra_fields( $address_fields ) {
    $address_fields['postcode']['required'] = false; //Postcode
    return $address_fields;
}

// Hide checkout fields
function reorder_billing_fields($fields) {
    $billing_order = [
        'billing_first_name',
        'billing_last_name',
		'billing_email',
//         'billing_company',
        'billing_country',
        'billing_address_1',
//         'billing_address_2',
//         'billing_city',
//         'billing_state',
        'billing_postcode',
        'billing_phone'
    ];

    foreach ($billing_order as $field) {
		if('billing_phone' == $fields['billing'][$field]){
			
		}
        $ordered_fields[$field] = $fields['billing'][$field];
    }

	$ordered_fields['billing_phone']['required'] = false;


    $fields['billing'] = $ordered_fields;

    return $fields;
}

add_filter('woocommerce_checkout_fields', 'reorder_billing_fields');