To repurpose a job slot (for example: job3) just disconnect both the Data Source and Data Destination and then select new settings.
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We may add an option to delete a job in the future, but it's a very low priority.
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Remember that Disconnecting a job (Source and Destination) removes all connection related information from it. So the the concept of "Deleting" a job has no meaning. A disconnected job is just available to be repurposed in the future for any new purpose.