基于LoicTheAzec在WooCommerce我的帐户订单列表中向客户发送的添加管理员订单说明的答案
这是我试图在WooCommerce管理订单列表的自定义列中显示私人和客户管理说明， Package 在<details>和<summary>标签中。

// Add custom column on admin orders list page
add_filter( 'manage_edit-shop_order_columns', 'add_order_notes_column' );
function add_order_notes_column( $columns ) {
    $columns['order_notes'] = 'Order Notes';
    return $columns;
}

// CSS styles
add_action( 'admin_print_styles', 'add_order_notes_column_style' );
function add_order_notes_column_style() {
    $css = '.post-type-shop_order table.widefat.fixed { table-layout: auto; width: 100%; }';
    $css .= 'table.wp-list-table .column-order_notes { min-width: 280px; text-align: left; }';
    $css .= '.column-order_notes ul { margin: 0 0 0 18px; list-style-type: disc; }';
    $css .= '.order_customer_note { color: #ee0000; }'; // red
    $css .= '.order_private_note { color: #0000ee; }'; // blue
    wp_add_inline_style( 'woocommerce_admin_styles', $css );
}

// Admin orders list custom column displayed content
add_action( 'manage_shop_order_posts_custom_column', 'add_order_notes_content' );
function add_order_notes_content( $column ) {
    global $post, $the_order;

    if( 'order_notes' !== $column )
        return;

    $order = is_a($the_order, 'WC_Order') ? $the_order : wc_get_order( $post->ID );

    $notes = wc_get_order_notes( array(
        'order_id' => $order->get_id(),
        'order_by' => 'date_created',
        'order' => 'ASC',
    ) );

    if( ! empty($notes) ) {
        echo '<details><summary>Click to read notes</summary><ul>';

        foreach( $notes as $note ) {
            if( $note->customer_note && 'system' !== $note->added_by ) {
                echo '<li class="order_customer_note">' . sprintf( __('%s by %s <br> %s:'),
                    date_i18n( 'm/d/y H:i', strtotime( $note->date_created ) ),
                    $note->added_by,
                    $note->content
                ) . '</li>';
            }

if( $note->private_note ) {
                echo '<li class="order_private_note">' . sprintf( __('%s by %s <br> %s:'),
                    date_i18n( 'm/d/y H:i', strtotime( $note->date_created ) ),
                    $note->added_by,
                    $note->content
                ) . '</li>';
            }
        }
        echo '</ul></details>';
    }
}

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然而，虽然客户笔记显示，这不是私人笔记的情况。任何帮助将不胜感激！