Unable to customize the woocommerce order area on backend

I have tested this code on our test site and it is working. Try to add the following code in the function.php of the child theme.

// Custom function where metakeys / labels pairs are defined
function get_filter_shop_order_meta( $domain = 'woocommerce' ){
    // Add below the metakey / label pairs to filter orders
    return [
        '_billing_company' => __('Billing company', $domain),
        '_order_total'     => __('Gran total', $domain), 
    ];
}

// Add a dropdown to filter orders by meta
add_action( 'restrict_manage_posts', 'display_admin_shop_order_by_meta_filter' );
function display_admin_shop_order_by_meta_filter(){
    global $pagenow, $typenow;

    if( 'shop_order' === $typenow && 'edit.php' === $pagenow ) {
        $domain    = 'woocommerce';
        $filter_id = 'filter_shop_order_by_meta';
        $current   = isset($_GET[$filter_id])? $_GET[$filter_id] : '';

        echo '<select name="'.$filter_id.'">
        <option value="">' . __('Filter by meta…', $domain) . '</option>';

        $options = get_filter_shop_order_meta( $domain );

        foreach ( $options as $key => $label ) {
            printf( '<option value="%s"%s>%s</option>', $key, 
                $key === $current ? '" selected="selected"' : '', $label );
        }
        echo '</select>';
    }
}

// Process the filter dropdown for orders by Marketing optin
add_filter( 'request', 'process_admin_shop_order_marketing_by_meta', 99 );
function process_admin_shop_order_marketing_by_meta( $vars ) {
    global $pagenow, $typenow;
    
    $filter_id = 'filter_shop_order_by_meta';

    if ( $pagenow == 'edit.php' && 'shop_order' === $typenow 
    && isset( $_GET[$filter_id] ) && ! empty($_GET[$filter_id]) ) {
        $vars['meta_key']   = $_GET[$filter_id];
        $vars['orderby']    = 'meta_value';
    }
    return $vars;
}
// (Optional) Make a custom meta field searchable from the admin order list search field
add_filter( 'woocommerce_shop_order_search_fields', 'shop_order_meta_search_fields', 10, 1 );
function shop_order_meta_search_fields( $meta_keys ){
foreach ( get_filter_shop_order_meta() as $meta_key => $label ) {
$meta_keys[] = $meta_key;
}
return $meta_keys;
}

Hello,

Can you please share the WP admin login details of your site so I will check and give you a possible solution.

Best Regards.

Hello,

Sorry to say but right now we are unable to access your Dashboard due to a critical error.

Could you please share your Site’s FTP Login details too so that we can further check?

Best Regards

Hello,

I have checked this code with the default woocommerce theme and it is still the same.
See screenshot for clarification:
https://ibb.co/bWLjVM4

Such modification requires complicated code customization which is not covered by our support. All the customizations made in the theme files are at your own risk. Our support doesn’t cover any issues caused by changes in the theme code.

Best Regards.

Hello,

Such modification requires complicated code customization which is not covered by our support. All the customizations made in the theme files are at your own risk. Our support doesn’t cover any issues caused by changes in the theme code.

You need to find a third party plugin to achieve more functionality that best suits you. We have not tested such kinds of plugins, so we don’t have any detailed suggestions
https://wordpress.org/plugins/additional-order-filters-for-woocommerce/

Best Regards.

Hello,

Such modification requires complicated code customization which is not covered by our support. All the customizations made in the theme files are at your own risk. Our support doesn’t cover any issues caused by changes in the theme code.

Best Regards.