How can I restrict User (Closer) from rescheduling events?

Navigate to AI Scheduler → Events page
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Locate Event you would like to disallow rescheduling of the events
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Click on the Event to open Event Builder
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Navigate to "Event Time & Limits" section
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Head to the "Allow closers to reschedule this event" toggle button
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Turn OFF to disallow event rescheduling
Or turn ON if you would like to allow Hosts to be able to reschedule event