Here is a small code snippet to remove the fields you want from checkout page on WooCommerce.

Just copy and paste the following snippet inside your functions.php on your child theme .

Note: The below code will actually remove all checkout fields from WooCommerce . Keep only the lines with unset for the fields you want to remove.

add_filter( 'woocommerce_checkout_fields' , 'wpslash_override_checkout_fields' );
  
function wpslash_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['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']);
    unset($fields['order']['order_comments']);
    unset($fields['billing']['billing_email']);
    unset($fields['account']['account_username']);
    unset($fields['account']['account_password']);
    unset($fields['account']['account_password-2']);

    return $fields;
}

If have are using WooCommerce for you food delivery or pickup needs of your restaurant take a look also on WooFood Plugin .