Computer Configuration > Administrative Templates > Google Chrome > Privacy Sandbox policies
Both
HKLM\Software\Policies\Google\Chrome
A policy to control whether your users see the Privacy Sandbox prompt. The prompt is a user-blocking flow which informs your users of the Privacy Sandbox settings. See https://privacysandbox.com for details about Chrome’s effort to deprecate third-party cookies. If you set this policy to Disabled, then Google Chrome won’t show the Privacy Sandbox prompt. If you set this policy to Enabled or keep it unset, then Google Chrome determines whether the Privacy Sandbox prompt can be shown or not and then show it if possible. If any of the following policies are set, it’s required to set this policy to Disabled: PrivacySandboxAdTopicsEnabled PrivacySandboxSiteEnabledAdsEnabled PrivacySandboxAdMeasurementEnabled