Computer Configuration > Administrative Templates > Microsoft Edge - Default Settings (users can override)
Both
HKLM\Software\Policies\Microsoft\Edge\Recommended
This setting lets you specify whether Internet Explorer will redirect navigations to sites that require a modern browser to Microsoft Edge. If you set this policy to 'Disable' ('Prevent redirection', value 0), Internet Explorer will not redirect any traffic to Microsoft Edge. If you set this policy to 'Sitelist', starting with Microsoft Edge major release 87 , Internet Explorer (IE) will redirect sites that require a modern browser to Microsoft Edge. (Note: The Sitelist setting is 'Redirect sites based on the incompatible sites sitelist', value 1). When a site is redirected from Internet Explorer to Microsoft Edge, the Internet Explorer tab that started loading the site is closed if it had no prior content. Otherwise, the user is taken to a Microsoft help page that explains why the site was redirected to Microsoft Edge. When Microsoft Edge is launched to load an IE site, an information bar explains that the site works best in a modern browser. If you want to redirect all navigations, you can configure the Disable Internet Explorer 11 policy, which redirects all navigations from IE11 to Microsoft Edge. It also hides the IE11 app icon from the user after the first launch. If don't configure this policy: - Starting with Microsoft Edge major release 87, you will have the same experience as setting the policy to 'Sitelist': Internet Explorer will redirect sites that require a modern browser to Microsoft Edge. - In the future, the default for your organization might change to automatically redirect all navigations. If you don't want automatic redirection, set this policy to 'Disable' or 'Sitelist'. For more information about this policy see https://go.microsoft.com/fwlink/?linkid=2141715 Policy options mapping: * Disable (0) = Prevent redirection * Sitelist (1) = Redirect sites based on the incompatible sites sitelist Use the preceding information when configuring this policy.