Disable customizing browser toolbars
User Configuration\Administrative Templates\Windows Components\Internet Explorer\Toolbars
Prevents users from determining which toolbars are displayed in Internet Explorer and Windows Explorer.
If you enable this policy, the list of toolbars, which users can display by clicking the View menu and then pointing to the Toolbars command, will appear dimmed.
If you disable this policy or do not configure it, users can determine which toolbars are displayed in Windows Explorer and Internet Explorer.
This policy can be used in coordination with the Disable customizing browser toolbar buttons policy, which prevents users from adding or removing toolbars from Internet Explorer.