Is there a way to disassociate a schedule from a runbook in the portal? Unless I'm missing something, you can only add a schedule to a runbook, but not remove it, unless the schedule itself is deleted. I know this can be done via PowerShell as follows:
Unregister-AzureRmAutomationScheduledRunbook -AutomationAccountName '<AccountName>' -RunbookName 'StartServiceFabricClusterNodes' -ScheduleName 'Daily7am' -ResourceGroupName '<ResourceGroup>'