@Venkata Bovilla - Thanks for the question and using MS Q&A platform.
This is the new changes in the UI and you see that the Data tab is not disabled, it's a sub category under New options. Under sub category you will find (Data, Compute, SQL, Data Engineering, & Machine Learning) as shown below. Note: Under Data category you will find (File upload & Add data) options.
The add data UI allows you to easily load data into Azure Databricks from a variety of sources. To access the UI, click New > Add data.
For more details, refer to Azure Databricks - Load data using the add data UI.
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