You can utilize the 'Instant Freeze' option to temporarily freeze your child's device. When you apply the freeze, your child will be unable to use the device until you unfreeze it. Remember, their devices won’t freeze instantly if they are not connected to the Internet, but when the Internet is turned on, their devices will freeze.
To freeze your child's device
Tap on the child to open the action pop-ups
Tap the Freeze option
To unfreeze your child's device
Tap on the child to open the action pop-ups
Tap on the Unfreeze option