Account restrictions via “Screen Time” don’t disappear even after disabled?
Try completely turning of screen time by pressing turn off screen time st the bottom of the page.

How to access your purchase history:

According to this Apple Support page:


  Go to Settings > [your name] > iTunes &amp; App Store.
  Tap your Apple ID, then tap View Apple ID. You might be asked to sign in with your Apple ID.
  
  If you use Family Sharing, you'll see in your purchase history what you bought using your Apple ID, but you won't see what other family members bought. To see what other family members bought, sign in with their Apple ID.
  
  Swipe up to Purchase History and tap it.