I just realized that this app shows all our account and device info to anyone in the house.
I want the app removed, how do I do that?
xfinity phone support was no help
My children cannot use the app because they do not know My Account name and password.
You can change yours if you need to.
As RobertWy mentioned, the xFi App on mobile and web is only accessbile by the Primary account holder and any unrestricted secondary users on the account that have an Comcast user ID.
If you would like to lock down the xFi App on X1, you can follow the steps in this article for setting up a PIN: https://www.xfinity.com/support/articles/x1-parental-controls-service-locks