Computer Configuration > Administrative Templates > Microsoft Edge
Both
HKLM\Software\Policies\Microsoft\Edge
Lets you decide whether the ads transparency feature is enabled. This behavior only applies to the "balanced" mode of tracking prevention, and does not impact "basic" or "strict" modes. Your users' tracking prevention level can be configured using the 'TrackingPrevention' (Block tracking of users' web-browsing activity) policy. AdsTransparencyEnabled will only have an effect if 'TrackingPrevention' is set to TrackingPreventionBalanced or is not configured. If you enable or don't configure this policy, transparency metadata provided by ads will be available to the user when the feature is active. When the feature is enabled, Tracking Prevention will enable exceptions for the associated ad providers that have met Microsoft's privacy standards. If you disable this policy, Tracking Prevention will not adjust its behavior even when transparency metadata is provided by ads.