Available Locations

The tree view is the default and principal view and it displays tree structures of linked issues, sub-tasks, epics and portfolio hiearchies  on the JIRA:

• Issue Detail page and the
• Agile Board: Detail View

Issue Detail View

A new Links Hierarchy tab panel is added on the JIRA issue page:

you can use the Atlassian's new user experience design, it's available from the drop-down menu:

Now, you can also see Hierarchy Links in a web panel of the issue.

Agile Board - Detail view

If the Jira Software application is installed then a new panel is added into the Board Detail View of the for the Scrum Plan:

it's available from the drop-down menu:

(Necessary to have the Atlassian's new user experience design activated)

...and also into the Kanban Work boards:

it's available from the drop-down menu: 

(Necessary to have the Atlassian's new user experience design activated)