Enable browsing restrictions and remove the ability to clear search and browsing histories from iPads
Step 1: Tap Settings on iPad, then Screen Time on left menu. Tap on Use Screen Time Passcode
Step 2: Enter a passcode to remove any restrictions that you’re about to set up. It is not possible to recover this code, the iPad would need to be wiped to reset this code. Enter the code again to confirm.
Step 3: Tap Content & Privacy Restrictions. On the new screen, turn the toggle on for Content & Privacy Restrictions, then tap Content Restrictions
Step 4: Tap Web Content, then on the new screen select “Limit Adult Websites”. This will remove the option for Private Browsing (where the history is not remembered) and remove the ability to clear browsing history.