Hi,
The plugin registers its emails as standard WooCommerce email classes, so they appear in WooCommerce → Settings → Emails where you can customize the subject line and heading out of the box.
For full body customization (layout, colors, footer, custom content blocks) you can use any WooCommerce email customizer plugin — YayMail, Kadence Emails, or Email Customizer for WooCommerce all work with the plugin’s emails. The withdrawal confirmation email for the customer is listed there as “Withdrawal confirmation (customer)”.
We don’t plan to build a custom email editor into the plugin itself since the existing WooCommerce ecosystem already covers this well.