To remove an issue from an epic,
- Log in to JIRA.
Click the Agile link's down-arrow in the top navigation bar, then select your preferred board from the resulting dropdown menu.
- Your board will be displayed.
- You can click either Plan or Work:
- In Plan mode, drag the issue onto the Issues without epics section at the bottom of the Epics panel; or
- In either Work or Plan mode, click the relevant issue to display it on the right-hand side of the screen, then click the x in the epic name (e.g. Apples in Screenshot 1 below).
Screenshot 1: removing an issue from an epic