Hi,
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You can do clean uninstallation for Microsoft Remote Desktop Client from Mac just like you do clean uninstallation for any other app on Mac. There is no other special steps for it.
In summary, you will need to terminate the app's all processes, uninstall the app and remove all related components.
You could refer to below article for completely uninstalling the app.
How to Uninstall Microsoft Remote Desktop Application/Software on Your Mac
For more reference:
How to Completely Uninstall an App on Mac
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