You can uninstall the Umbrella Roaming module as a regular program uninstallation procedure:
Locate the app in the Finder. ...Drag the app to the Trash, or select the app and choose File > Move to Trash.
What I do in such a scenario is to create a new policy that I will set at the top of the stack and as the identity, I will place that specific user:
This way, that user will be allowed but the rest will be blocked.
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