I restarted the Roon UI on my desktop and it download and rebooted the Nucleus +. I restarted the UI again and it did this at least one more time. The Nucleus + is now:
Thank you the feature now appears. I had though I would be prompted to udpate. This happens fairly regularly. In this case it did not. I often quit the UI because of the bug that causes that to consume a large amount of the CPU.