Hello Thushar, Welcome to MS Q&A
If you have Unity Catalog enabled but cannot find the Serverless compute option under the 'compute' tab in Databricks, it may be because your workspace is not eligible for serverless compute. To be eligible for serverless compute for notebooks and jobs, your workspace must meet certain requirements, including having Unity Catalog enabled.
If your workspace meets the eligibility requirements, an account admin can enable serverless compute for the eligible workspaces in the account by following the steps outlined in the Enable serverless compute article.
References:
Please let us know if you have further questions
Kindly accept answer if it helps
Thanks
Deepanshu