Install or extract the administrative template files to a folder.
Copy all the administrative templates to C:\Windows\Sysvol\domain\policies\PolicyDefinitions overwrite files in the destination folder where needed. (This will not break any GPOs and if something doesn’t look right you can always re-copy all the files from C:\Windows\PolicyDefinitions)
Now when you edit a policy you will see the new settings, specifically in this case we now see settings for the Edge browser.
Keep in mind that all policies don’t apply to all versions of the OS so keep an eye on the requirements of the policy that you are setting.