pipdig

This plugin will re-add the “Purchased Items” column which was removed in WooCommerce 3.0. Order information is loaded via Ajax when the button is clicked. Saving resources on each page load.
After updating WooCommerce to version 3.0+, you may notice that the “Purchased Items” column is no longer in the orders list. The reason for removing this column was to save resources (each time the orders page is loaded, it was loading every order to create the query). To fix this issue, we created this plugin which queries the order data only when you click the “View Products” button.
The quantity and product name will be listed for an order when the button is clicked.
This free plugin is brought to you by <a href="https://www.pipdig.co/" rel="nofollow ugc">pipdig</a>

Purchased Items Column for WooCommerce Orders

Display a "Purchased Items" column on the WooCommerce orders page.

yakacj

ycplugins

This plugin for WordPress/WooCommerce stores, by this plugin you can add new unlimited custom order columns to shop order list at admin side. 
Need to enter column title and meta key for obtain/show value for new column in plugin settings page.
<h3>Support</h3>
For any support about this plugin, please view plugin forum or create new topic here <a href="https://wordpress.org/support/plugin/new-custom-order-columns
/">forum</a>

New Custom Shop Order Columns

Add new custom order columns to admin shop order list in WooCommerce.

Purchased Items Column for WooCommerce Orders vs New Custom Shop Order Columns