ScreenTime: Block the Messages, Phone, Camera apps

I want to limit my child's phone usage at night by allowing them to scan a QR code to enforce app limitations via ScreenTime.

When they scan the QR code, I'm still unable to prevent them from accessing the Phone, Messages, and Camera app via ScreenTime.

1. Is there a way I can block or heavily restrict their access to these three apps via ScreenTime?

2. How do I prevent my child from undoing or evading the ScreenTime enforcement I'm trying to enforce?