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Hi @TJ Pacheco
AFAIK, there's no registry or group policy can remove 'Define' option in Edge context menu now.
The only related registry/policy for smart actions is SmartActionsBlockList. But according to the doc, it can only block smart actions in PDF now. Maybe that can't meet all your requirements, so I suggest that you can provide feedback to Edge team about adding this feature. You can press Alt+Shift+I in Edge to send the feedback. They will check the feedback and improve the product continuously. Thanks for your understanding.
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Regards,
Yu Zhou