There will be times when a field is no longer needed. When this happens, instead of deleting the field, which would also remove all its data, you can choose to hide it. So if you need the field again further down the track, you can simply unhide it and retain all the data.
In this recipe, we will be hiding both the Priority and Due Date fields.
Proceed with the following steps to hide a field in JIRA:
Log in to JIRA as a JIRA administrator.
Navigate to Administration | Issues | Field Configurations.
Click on the Configure link for the field configuration used by the project and issue type.
Click on the Hide link for Priority and Due Date.