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Personally, until they stop using a 4-digit PIN to make changes then it'll be hard for the parents to think of a secure authentication mechanism. Security is only as strong as the weakest link, in this case it's only 4-digits. Until more people raise it with Apple support then it'll not change.

This. The 4-digit password is useless. I was stunned there wasn't an option even to make it 6 digits, but free form is best.
 
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How do you set limits on a single app? I've only ever seen it on app "categories", and if you don't pay attention (Twitch is in the Creative category, not Entertainment), you're not limiting what you think you are.

Under Screen Time, Look at "See All Activity". Then on most used you should see fortnite if they have the app. Click on it. Then scroll all the way at the bottom & you will see "add limit". That should ease your confusion.
 
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