Currently, there are XMind (open source and free), XMind Plus, XMind Pro and XMind Pro Subscription. These packages have different features or use different business modes. It is necessary and helpful to know your current package. Below are two ways to know that.
On the title, XMind shows your current package. The image below shows this is XMind Pro.
XMind About dialog
Choosing "Help -- About" from the menu, you can open XMind About dialog. Here, you will see all details about your XMind, like version no., current package, whom is licensed to and etc.