Navigate the the location below in your registry and make the corresponding change.  The Value  from the list below may need to be created.

You can also replace HKEY_CURRENT_USER with HKEY_LOCAL_MACHINE in the key below and have the setting be a machine wide restriction.

Key: [HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Restrictions]
Data Type: REG_DWORD
Data: (0 = disable restriction, 1 = enable restriction)

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