Screentime limits can be overridden

Hi there

I set time limits using screen time for my children.

However, it is possible for them, once the limit has been reached, that they can amend the time on their phone to be granted more time!!

is there a way to disable the settings app or implement some code so that regardless of the time on the phone, screentime knows the usage amount and verifies it?

without this, the time limit functionality is irrelevant? Especially if a 10yr old can by pass it 🤣🤣

16hr on the settings app???????