Disable XB7 public WiFi hotspots

I have Xfinity fiber service with a Nokia fiber ONT connected by Ethernet to a white Xfinity XB7 gateway (CGM4331COM). My ASUS router handles my home network, but the XB7 is still broadcasting the public SSIDs “xfinitywifi” and “Xfinity Mobile.” I confirmed these are coming from my XB7 by unplugging power from only the XB7; both SSIDs disappeared, and they returned when I powered it back on. The Xfinity app does not give me the hotspot control, and the hotspot settings page says my device does not support public hotspots. I need an Xfinity representative to disable both public hotspot broadcasts while leaving bridge mode unchanged.