You can now open ProperTree via Main Menu!
If you're ready to configure your OpenCore disk image, you can now go ahead and open ProperTree however you'd like, or by using the DarwinKVM Main Menu option. You will still have to navigate to the proper path and open the config.plist that is within your disk image!
You can now use the Navigation Bar to select the Mac Pro Model you want to use, according to the OS release version you intend to install.