User Configuration > Administrative Templates > Microsoft Word 2016 > Word Options > Advanced
User
HKCU\software\policies\microsoft\office\16.0\word\options
This policy setting governs how custom formatting and data labels react to data changes in a chart. If you enable or do not configure this policy setting, when the user creates a new presentation, custom formatting and data labels follow data points as they move or change in any chart in the workbook. If you disable this policy setting, custom formatting and data labels do not follow data points, but instead follow data point indices.