@Rama Teja Reddy Damireddy​ :

To see the Unity Catalog databases and tables in the drop-down in Azure Databricks Delta Lake, you need to configure the integration between Unity Catalog and Databricks. Here are the steps to configure the integration:

1. Navigate to your Databricks workspace and click on the "Admin Console" button on the left-hand side of the screen.
2. Click on the "Data" tab and then click on "Connect" next to Unity Catalog.
3. Enter your Unity Catalog credentials and click "Connect".
4. You should now see your Unity Catalog databases and tables in the drop-downs in Delta Lake.

If you have already followed these steps and are still not seeing the Unity Catalog databases and tables, you may want to check if the user account you are using has the necessary permissions to access the Unity Catalog.