User Configuration > Administrative Templates > Microsoft Visio 2016 > Visio Options > Advanced > Editing Options
User
HKCU\software\policies\microsoft\office\16.0\visio\application
This policy setting allows you to configure ShapeSheet Formula AutoComplete. If you enable this policy setting, ShapeSheet Formula AutoComplete is turned off. If you disable or do not configure this policy setting, ShapeSheet Formula AutoComplete is turned on.