User Configuration > Administrative Templates > Microsoft Office 2016 > Contact Card
User
HKCU\software\policies\microsoft\office\16.0\common\contactcard
This policy setting allows you to specify the way contact information is displayed. If you enable this policy setting the global address list (GAL) dialog is displayed instead of the Contact Card when users double click a contact in Outlook. If you disable or do not configure this policy setting the Contact Card is displayed when users double click a contact in Outlook.