Computer Configuration > Administrative Templates > Microsoft Edge > Network settings
Both
HKLM\Software\Policies\Microsoft\Edge
This feature enables the use of dictionary-specific content encodings in the Accept-Encoding request header ("sbr" and "zst-d") when dictionaries are available for use. If you enable this policy or don't configure it, Microsoft Edge will accept web contents using the compression dictionary transport feature. If you disable this policy, Microsoft Edge will turn off the compression dictionary transport feature.