Hello @Janaka Hewavitharana ,
Welcome to the Microsoft Q&A platform.
After I create a data asset and want change the user details connecting to a data source, how do you do it?.
You can use manage data assets to change the user details.
Reference: Manage data assets in Azure Data Catalog
If I want to delete a registered data asset completely, how do I do it? select all object and deleting it seems to still leaving the data asset!
How do I delete my registered data objects?
You can delete an object from Data Catalog by selecting the object in the portal and then clicking the Delete button. Removing the object removes its metadata from Data Catalog but does not affect the underlying data source.
Reference: Azure Data Catalog – Remove data assets
Hope this helps. Do let us know if you any further queries.
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