- Go to General --> Settings --> Issue configuration --> Issue Types
- Click on the edit icon.
- Uncheck the "Mandatory" checkbox to the right of the text field containing the text "Description" Field (below label "Specify the labels for the textarea")
- Navigate back into the tree to the left and go to the node "Issue fields"
- Click on your "Issue field Configuration", such as "Default"
- Find the Description field in the list
- Uncheck the "Mandatory" checkbox for the field
- Click save
- Close down all your project tabs (or log out from the system and log in again).
- The next time you open your project, the description field isn't mandatory any more.