Given that Tableau
apparently refuses to allow proper editing of the Data Source
I have resorted to creating a new one from scratch.
The screenshot shows the situation: the old Data Source "NY FIPS 5" is still being attached to the Worksheet.
The intention is to use the new DataSource usCountyCrimeSummary
: however it is unclear ( to me at least) how to disconnect the old Data Source from the existing sheet and then attach the new DataSource to that sheet.
The big surprise was when clicking on Edit Connection
it did not allow selecting a different Data Source : instead it went into the properties of the existing Data Source. So then how to switch the Data Source?