Computer Configuration > Administrative Templates > Microsoft Edge > Content settings
Both
HKLM\Software\Policies\Microsoft\Edge
Define a list of sites, based on URL patterns, where multiple successive automatic downloads aren't allowed. If you don't configure this policy, 'DefaultAutomaticDownloadsSetting' (Default automatic downloads setting) applies for all sites, if it's set. If it isn't set, then the user's personal setting applies. For more detailed information about valid URL patterns, see https://go.microsoft.com/fwlink/?linkid=2095322. Example value: https://contoso.com [*.]contoso.com