Computer Configuration > Administrative Templates > Microsoft Edge
Both
HKLM\Software\Policies\Microsoft\Edge
If you enable this policy, or don't configure this policy, a web page can use screen-share APIs (for example, getDisplayMedia() or the Desktop Capture extension API) for a screen capture. If you disable this policy, calls to screen-share APIs will fail. For example, if you're using a web-based online meeting, video or screen sharing will not work. However, this policy is not considered (and a site will be allowed to use screen-share APIs) if the site matches an origin pattern in any of the following policies: 'ScreenCaptureAllowedByOrigins' (Allow Desktop, Window, and Tab capture by these origins), 'WindowCaptureAllowedByOrigins' (Allow Window and Tab capture by these origins), 'TabCaptureAllowedByOrigins' (Allow Tab capture by these origins), 'SameOriginTabCaptureAllowedByOrigins' (Allow Same Origin Tab capture by these origins).