Unable to change update method to replace in dataflow

Hi IAMCS ,

Thank you for reaching out to the Microsoft fabric community forum.

You're correct, when creating a Dataflow within a warehouse, the destination is auto assigned, which is efficient for bulk ingestion. However, this method currently does not expose options for Update Method (defaults to Append) or Column Mapping. This is expected behavior in Fabric’s current design.

To modify the Update Method (e.g., set to "Replace") and configure column mappings, you'll need to create the Dataflow at the workspace level. While this requires manual destination assignment for each table, it's currently the only supported way to access full configuration options.

We understand this limitation and recommend submitting feedback via Fabric Ideas - Microsoft Fabric Community

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Thankyou.