@darkefshad i wrote a message on their support form on quadlayer website.
They said that this function is allowed only for premium users. I didn’t understand why, but in my experience the plugin worked properly until the last month, and it sent the additional fields on woocommerce order email with the free version too. They said that it has been ever a premium feature… so strange!
My plugin is setted exactly as your screenshot. The additional fields should be send by default settings but it doesn’t works.