Recently the Dataflow mapping UI was replaced by a new 'Preview' version. I haven't been able to find any documentation about this.
I would like to disable this since it seems to attempt to automatically map columns from the query to the destination table. This might be helpful when creating a new dataflow, but for existing dataflows it's likely I've already mapped the columns that need mapping, and mapping any others could be detrimental.
Can this 'preview' be disabled?