Remove all Checkout Fields

I would like to remove all CHECKOUT fields from the page so that the customer can just proceed to PayPal. I had something originally worked before the upgrade in my child functions.php

Below is what used to work.

<?php
/**
* This is where you can copy and paste your functions !
*/
// As of 3.1.10, Customizr doesn't output an html5 form.
add_theme_support( 'html5', array( 'search-form' ) );
add_filter('wp_nav_menu_items', 'add_search_form_to_menu', 10, 2);
function add_search_form_to_menu($items, $args) {
  // If this isn't the main navbar menu, do nothing
  if( !($args->theme_location == 'main') ) // with Customizr Pro 1.2+ and Cusomizr 3.4+ you can chose to display the saerch box to the secondary menu, just replacing 'main' with 'secondary'
    return $items;
  // On main menu: put styling around search and append it to the menu items
  return $items . '<li class="my-nav-menu-search">' . get_search_form(false) . '</li>';
}
/**
 * woocommerce_package_rates is a 2.1+ hook
 */
add_filter( 'woocommerce_package_rates', 'hide_shipping_when_free_is_available', 10, 2 );

/**
 * Hide shipping rates when free shipping is available
 *
 * @param array $rates Array of rates found for the package
 * @param array $package The package array/object being shipped
 * @return array of modified rates
 */
function hide_shipping_when_free_is_available( $rates, $package ) {

 	// Only modify rates if free_shipping is present
  	if ( isset( $rates['free_shipping'] ) ) {

  		// To unset a single rate/method, do the following. This example unsets flat_rate shipping
  		unset( $rates['flat_rate'] );

  		// To unset all methods except for free_shipping, do the following
  		$free_shipping          = $rates['free_shipping'];
  		$rates                  = array();
  		$rates['free_shipping'] = $free_shipping;
	}

	return $rates;
}
add_filter( 'woocommerce_checkout_fields' , 'custom_override_checkout_fields' );

function custom_override_checkout_fields( $fields ) {
unset($fields['billing']['billing_first_name']);
unset($fields['billing']['billing_last_name']);
unset($fields['billing']['billing_company']);
unset($fields['billing']['billing_address_1']);
unset($fields['billing']['billing_address_2']);
unset($fields['billing']['billing_city']);
unset($fields['billing']['billing_postcode']);
unset($fields['billing']['billing_country']);
unset($fields['billing']['billing_state']);
unset($fields['billing']['billing_phone']);
unset($fields['order']['order_comments']);
unset($fields['billing']['billing_address_2']);
unset($fields['billing']['billing_postcode']);
unset($fields['billing']['billing_company']);
unset($fields['billing']['billing_last_name']);
unset($fields['billing']['billing_email']);
unset($fields['billing']['billing_city']);
return $fields;
}

https://ww.wp.xz.cn/plugins/woocommerce/