Computer Configuration > Administrative Templates > Microsoft Edge
Both
HKLM\Software\Policies\Microsoft\Edge
DEPRECATED: This policy is deprecated. It is currently supported but will become obsolete in a future release. This policy is deprecated because it's been replaced by the Microsoft Edge sidebar. Microsoft Office applications are now available in the sidebar, which can be managed by HubsSidebarEnabled policy. When users can access the Microsoft Office menu, they can get access to Office applications such as Microsoft Word and Microsoft Excel. If you enable or don't configure this policy, users can open the Microsoft Office menu. If you disable this policy, users won't be able to access the Microsoft Office menu.