Device supervision-Administrator controls settings/. What does this mean?
I don’t know what Device Supervision / and what Administrator controls settings means
iPhone SE (Gen 3)
Do you have a MDM profile?
See this Apple article: Checklist: If you want to see if anyone else has access to your device or accounts
Checklist: If you want to see if anyone else has access to your device or accounts - Apple Support
See point 5.