Hey
If your goal is to use visual data transformations in ADF using Mapping Data Flows with on-prem data, then build a pipeline with a Copy Activity first. Use the Self-Hosted Integration Runtime with the Copy Activity to stage your data in Blob Store. Then add a subsequent Execute Data Flow activity to transform that data.
As SQL server(Onprem) is not supported in dataflows:
https://learn.microsoft.com/en-us/answers/questions/312392/why-on-premise-sql-server-source-table-not-visible.html