Hello @sagdec ,
Welcome to the Microsoft Q&A platform.
Using Portal:
After you've registered a data source, you can discover it by using filtering and search from within the Data Catalog portal.
Reference: How to discover data sources in Azure Data Catalog
Using REST API:
The Data Catalog has a Search query syntax: Search data assets
Data Asset: Provides operations for working with data assets and annotations.
For updated Data Catalog features, please use the new Azure Purview service, which offers unified data governance for your entire data estate.
Hope this helps. Do let us know if you any further queries.
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