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:

For Jira Cloud(since version 7.1.1)

Hierarchy to return to its usual location in the Activity panel. Therefore, the locations are the same as in Server:

if there is little width for the Activity panel options, Jira displays a select...

For Jira Cloud (versions older to 7.1.1)

You can use the Atlassian's new user experience design

Links Hierachy has been moved to web panel.

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:

For Jira Cloud (versions older to 7.1.1)

it's available from the drop-down menu:

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

Links Hierachy has been moved to web panel.

...and also into the Kanban Work boards:

For Jira Cloud (versions older to 7.1.1)

it's available from the drop-down menu:

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

Links Hierachy has been moved to web panel.