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#11
You have no settings hidden on that page, all the ones that should there are shown, but are greyed out.
The 'Download Mode' policy controls the settings on this page, it creates values in the key...
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\DeliveryOptimization
I've just checked on a Pro machine that has not had any restrictions put in place, that key does not exist. If you have that key then delete it, Restart, then see if that removes the 'managed...' message.
There's a useful spreadsheet that details all the registry settings used by group policies. I've checked it and cannot see any other policy that may be relevant to this. You may want to check for yourself in case I've missed something.
Group Policy Settings Reference Spreadsheet for Windows 10 v1803