If you aren't sure you entered your Apple ID and password when setting up Screen Time on your own device, reset it this moment.

You might set up Screen Time to put a bar in front of yourself from spending too much time on apps. What if you forget its passcode?

As it stands, no Screen Time passcode is required to delete messages. There is also no option to disable deleting messages.

For example, you can opt to disable Screen Distance for your iPhone or iPad, but enable Screen Distance on your child’s iPhone or iPad.