My roommate moved out and I don't want to use her accounts for paid apps. I see no way of doing this in Settings > Applications. Is there any way to do this? Is there a way to reset the Flex box completely? All of the forum questions about this are locked or unanswered, or supposedly answered in a direct message.
This support article should help you out: https://www.xfinity.com/support/articles/x1-clear-cookies-and-local-data-storage
(You may want to note the FAQs at the end of the article before taking any action.)
Alternatively, if you prefer, you could launch and sign out of each app individually.