Are you using Jira Cloud? Is this by chance an Kanban board?
Kanban boards have not always had this feature to show epics in the side view like Scrum boards have in Jira Software. But even in the new layout, you should still be able to configure Jira Cloud Kanban boards (or Jira Server 7.4.x kanban boards) to show the Epic tab on the board again.
You need to configure the board to do this though. On Jira Cloud this is the ... button in the top right of the board screen, then click 'board settings'. From there navigate to columns and make sure the epics panel is enabled.
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