Computer Configuration > Administrative Templates > Microsoft Edge
Both
HKLM\Software\Policies\Microsoft\Edge
OBSOLETE: This policy is obsolete and doesn't work after Microsoft Edge 93. This policy is obsolete because it was intended for short-term adaptation purposes only. It doesn't work in Microsoft Edge after version 93. When enabled the User-Agent Client Hints feature sends granular request headers that provide information about the user browser (for example, the browser version) and environment (for example, the system architecture). This is an additive feature, but the new headers may break some websites that restrict the characters that requests may contain. If you enable or don't configure this policy, the User-Agent Client Hints feature is enabled. If you disable this policy, this feature is unavailable.