User Configuration > Administrative Templates > Microsoft Visio 2016 > Visio Options > Advanced > Editing Options
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HKCU\software\policies\microsoft\office\16.0\visio\application
This policy setting allows you to show more shape handles when hovering over a selected shape. If you enable this policy setting, more shape handles will be shown after a brief delay. If you disable or do not configure this policy setting, more shape handles will not be shown.