Doug, You are right it doesn't show in the app list for installs but it should show on the permission list. If you go to Settings and search for "Special Access" that will take you to a list that should have "Wi-Fi control" on the bottom. That will load a list of apps with "XFINITY WiFi Settings" at the bottom. Once you click on that you can turn off the option to "Allow app to control Wi-Fi". I've had my phone running this way for over a month now and I have never seen that XFINITY hotspot show back up with no downsides. I beleive that the WiFi control history was empty because it only shows apps turning WiFi on and off and not changing the connected hotspot.
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