Internet Explorer assigns all websites to one of four security zones: Internet, Local intranet, Trusted sites, or Restricted sites. The zone to which a website is assigned specifies different security settings that may lead to different behaviors. Following domains allow you to test the browser labs in different security zones in IE. Before navigating to following domains, you need to either map these domains into the correct security zone manually or run following command to map these domains automatically.
To re-enable IE as a standalone browser, open Registry Editor (regedit.exe) as an administrator, navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Internet Explorer\Main and delete the key named NotifyDisableIEOptions or you can execute the following command in an elevated CMD or PowerShell window: