User Configuration > Administrative Templates > Microsoft Office 2016 > File Open/Save dialog box > Places Bar Locations
User
HKCU\software\policies\microsoft\office\16.0\common\open find\adminaddedplaces
This setting configures the list of items displayed in the Places Bar of the Common File dialog boxes. Valid items include browseable paths and environment variables of the form %...%. Items will be displayed in the Places Bar in the order in which they are entered into the template.