As per the JIRA 6.4 Release Notes:
New sidebar preview
We've been working hard on improving JIRA's user interface, and in JIRA 6.4 we're giving you a preview of what we've been working on. We wanted to make accessing your project's information as efficient as possible, so we've introduced a navigation sidebar to sit alongside your workspace. This makes it easier to access all project information from one view, and helps you work more efficiently, especially if you also use JIRA Agile. We've also added project shortcuts to the sidebar, which now allow you to add links to online resources that are shared with anyone who has access to your project. We're also collecting feedback on this new experience, and would love to hear from you on how we can improve your project navigation experience even further.
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