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 stop the Hover Menu from displaying when a user hovers over a contact’s presence icon or display name with the mouse cursor. If you enable this policy setting, when a user hovers over a contact’s presence icon or display name with the mouse cursor, the Hover Menu will not be displayed. If you disable or do not configure this policy setting, the Hover Menu appears when a user hovers over a contact’s presence icon or display name with the mouse cursor.