Hi @Sunny Wong
For Downloads> Open Office files in the browser, the corresponding group policy is QuickViewOfficeFilesEnabled. The registry setting is like below:
For Downloads> Show downloads menu when a download starts, there's no corresponding group policy and registry setting. If you want to control this setting through group policy or registry, I suggest that you can provide your feedback to Edge team by pressing Alt+Shift+I in Edge. Edge team will check the feature request and improve the product continuously. Thanks for your understanding.
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Regards,
Yu Zhou