You can see your child's device use during Free Time on the Insights page. If you have more than one child, you can cycle between their insights by tapping on your child’s avatar on the top right. If your child is spending too much time during Free Time, you can set a limit for it as well.
To view your child’s 'Free Time' usage today,
Tap on the child and go to the 'Insight' page.
Under the 'free-time limit' section, you can see the free-time usage.