Computer Configuration > Administrative Templates > Microsoft Edge > Private Network Request Settings
Both
HKLM\Software\Policies\Microsoft\Edge
OBSOLETE: This policy is obsolete and doesn't work after Microsoft Edge 137. Specifies whether to apply restrictions to requests to more private network endpoints When this policy is Enabled, anytime when a warning is supposed to be displayed in the DevTools due to Private Network Access checks failing, the request is blocked. When this policy is Disabled or unset, all Private Network Access warnings aren't enforced and the requests aren't blocked. See https://wicg.github.io/private-network-access/ for Private Network Access restrictions. Note: A network endpoint is more private than another if: 1) Its IP address is localhost and the other isn't. 2) Its IP address is private and the other is public. This policy is obsolete. The earlier blanket override has been replaced by the permission-based Local Network Access model, which blocks cross-space requests until users give explicit consent.