1. Login to Azure DevOps: https://dev.azure.com/
![Azure DevOps]()
2. Go to Organizations settings (Below left Corner).
![Organizations settings]()
3. Click on Settings.
![Settings]()
4. Under General Section
- Enable or Disable the creation of classic build pipelines.
- Disable the creation of classic release pipelines.
![General Section]()
Now you can create new Classic Build and release pipelines.
Thanks!