So we can better assist you, please provide a brief description of your current setup using the template I added to your post.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
We’ll be back in touch once we have your set-up details. Thanks!
If you mean the AUDIONUC PC, you would need to stop running Roon software on the PC. When you run Roon software on a client, it will interact with the RAATserver on the core to create the available audio devices on that client. There is no way to not have this occur, unless of course you stop running Roon on that PC.
The only thing missing from the server is the user interface; server provides Core and Output functionalities. It recognizes the output devices on your Audionuc computer and makes them available for Roon. If you don’t need those output devices, just don’t enable them.