An overview is a customizable way of displaying only relevant linked issues on the current issue.
In addition, it's possible to edit any displayed custom fields, following the right current user's permission
You can configure one location by overview from the following list but you can configure multiple overviews for one project.
Jira Software and Jira Service Management Agent locations
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Issue Glance view
Issue Panel view
Issue Activity view
Jira Service Management locations
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Request details
Request panels
How to configure an overview
In the following pages, you will find the full explanation of the 3-part overview configuration.