Hi Kouyouk CA,
Thanks for updating us with your replies. From what it sounds like, it is possible that your children are able to access YouTube, Netflix, etc. using a guest account on your Xbox console, therefore bypassing your attempts to restrict their content access
via their own profiles. No worries, though! You can also set up ways to manage accessible apps for this as well. Here are some support articles that you may find handy in navigating this issue:
Set up an Xbox One guest account << what has likely happened is they've set one up
Set up and manage a guest key on your Xbox One console << here's how to set limitations
Use content limits on Xbox One when no one is signed in <<
just in case there is no guest account, this is your best bet
The last support article is really handy as it can help with the following:
- Prevent access to inappropriate content
- Block explicit TV
- Restrict the ability to add or create accounts on the console
Have a try at the settings and solutions and let us know the results.
I hope that this helps you out a bit more and wish you the best of luck!