How do I disable the Wi-Fi radio on an XER10 gateway

I have an XER10 gateway with Xfinity fiber internet via an EPON. I want to disable the Wi-Fi radio in the gateway so I can add several Ubiquiti AP's controlled by a Cloudkey Gen2+ controller. I can see how to turn off the SSID broadcast name via the Xfinity mobile app, but I want to DISABLE the Wi-Fi radio as described by Xfinity in Hide or disable your in-home WiFi network - Xfinity Support. This article says to log into the Admin Tool and "navigate to Gateway > Connection > Wi-Fi, where you will see your private WiFi network name(s) displayed" except there aren't any submenus named Gateway, Connection, nor Wi-Fi on the XER10 Admin Tool.

Please explain how I can disable the Wi-Fi radio on the XER10 for the 2.4, 5, and 6 GHz bands so it doesn't interfere with my AP's. What am I missing?

Another approach (which I would love to have available) would be to put the XER10 into Bridge Mode but Bridge Mode isn't implemented by Comcast on the XER10 and there is no forecast as to when this feature might be made available.