Once you have a new field configuration scheme set up, you will be able to add mapping between field configurations and issue types. For each field configuration scheme, one issue type can be mapped to only one field configuration, while each field configuration can be mapped to multiple issue types. The following screenshot shows that the issue types, Epic, Story, and Task, all have specific field configurations applied, and that the Default Field Configuration will be applied to all other issue types that are not explicitly mapped, such as Bug:

When a field configuration scheme is first created, Jira creates a default mapping, which maps all unmapped issue types to the default field configuration. You cannot delete this default mapping as it acts as a catch-all condition for mappings that you do not specify in your scheme. What you need to do is add more specific mappings that will take precedence over this default mapping:

1. Browse to the View Field Configuration Schemes page
2. Click on the Configure link for the field configuration scheme you wish to configure
3. Click on the Associate an Issue Type with a Field Configuration button
4. Select the issue type and field configuration from the dialog
5. Click on the Add button to add the mapping

You can repeat these steps to add more mapping for other issue types. All unmapped issue types will use the Default mapping.