Thanks for clarification.
Please note that when you select the "Edit only this occurence .."
option - you are editing an exception of the occurence. That's why you can perform a check whether the Appointment's RecurrenceState is an Exception and only in that case to disable the recurrence checkbox:
sender, SchedulerFormCreatedEventArgs e)
(e.Container.Mode == SchedulerFormMode.AdvancedEdit)
(e.Appointment.RecurrenceState == RecurrenceState.Exception)
Panel recurrencePanel = (Panel)e.Container.FindControl(
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