The Xone manual says, “Microsoft Windows® PC: In order to access the soundcard channels on your XONE:96 you will need to install the dedicated, ASIO* compatible, Device Drivers, which can be downloaded from the Allen & Heath website”.
For licensing reasons, Audacity does not ship with ASIO included. It is however available for free. All you have to do is compile your own private version of Audacity. See here: ASIO support in Audacity 2.4.2 - #13 by jademan