Required fields such as Summary and Issue Type have a little red asterisk next to them, which means they must have a value when you are creating or updating an issue. This is a great way to ensure users will not skip filling in important information.
We will look at how to make any fields of your choice required in this recipe, with field configurations. A field configuration controls the behaviors of a field; these include the field's mandatory requirements, visibility, renderer, and description.
Proceed with the following steps to make a field required in JIRA:
When a field is marked as required, JIRA will check to make sure the field has a value when you are making updates to the issue, such as an edit or during a workflow transition. This validation is applied even if the field is not present on the screen, so make sure you do not make a field that is not required on screen, otherwise users will not be able to complete the action.
Certain fields such as Assignee and Due Date require the user to have certain permissions to make updates. If the user does not have the necessary permissions, the validation will fail and prevent the user from completing the action.
Clicking on the Optional link will make the field not required. Certain fields such as Issue Type must be required.