Remove fields from WooCommerce checkout page.

remove_checkout_fields.php

<?php

add_filter( 'woocommerce_checkout_fields' , 'custom_remove_woo_checkout_fields' );
 
function custom_remove_woo_checkout_fields( $fields ) {

    // remove billing 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['billing']['billing_email']);
   
    // remove shipping fields 
    unset($fields['shipping']['shipping_first_name']);    
    unset($fields['shipping']['shipping_last_name']);  
    unset($fields['shipping']['shipping_company']);
    unset($fields['shipping']['shipping_address_1']);
    unset($fields['shipping']['shipping_address_2']);
    unset($fields['shipping']['shipping_city']);
    unset($fields['shipping']['shipping_postcode']);
    unset($fields['shipping']['shipping_country']);
    unset($fields['shipping']['shipping_state']);
    
    // remove order comment fields
    unset($fields['order']['order_comments']);
    
    return $fields;
}

Thank You Bro

the most valuable update here could be I think that you need to set priority to 9999 to the hook because we want to run it as late as possible. The code will be. That helped me a lot, 'cause billing_address_2 and billing_first_name fields were not hidden until I set this priority. Hope this helps someone 😉
add_filter( 'woocommerce_checkout_fields' , 'custom_remove_woo_checkout_fields', 9999 );