Administrators can deploy ActiveX Filtering for their organizations by setting a group policy.
GPO Location: Administrative Templates | Windows Components | Internet Explorer
The description for Turn on ActiveX Filtering group policy setting states that if you disable this policy setting or do not configure it, ActiveX Filtering will not be enabled by default for the user. And the user can turn ActiveX Filtering on or off.
However, if you disable this policy setting, the user interface for this feature under Tools | Safety | Activex Filtering is disabled.