Hi all,
This is Tom from the development team.
I’ve checked the issue – you are right. Due to how this WooCommerce email preview function is coded, it’s always previewing the last of our custom emails. I.e., if you set the “Number of custom emails” option in our plugin to, e.g., 10, it always previews “Custom email #10”, no matter which custom email settings you are viewing. I’m still searching for a solution to this problem. I will get back to you about this as soon as possible.
P.S. Regarding deleting the plugin data – in the latest plugin version 3.6.8, we’ve added a new tool to “WPFactory > Custom Emails > General > Advanced Options > Delete plugin data”. Now you can delete all plugin data, including all custom email settings, with a single click.