Computer Configuration > Administrative Templates > Microsoft Edge
Both
HKLM\Software\Policies\Microsoft\Edge
This policy lets the native PDF viewer in Microsoft Edge show a button that lets a user looking for advanced digital document features to discover and subscribe to premium offerings. This is done via the Acrobat extension. If you enable or don't configure this policy, the button will show up on the native PDF viewer in Microsoft Edge. A user will be able to buy Adobe subscription to access their premium offerings. If you disable this policy, the button won't be visible on the native PDF viewer in Microsoft Edge. A user won't be able to discover Adobe's advanced PDF tools or buy their subscriptions.