Use Epic Backlog to manage and track your backlog of feature work.
On the Milestones page, you will find the Epic Backlog, where all Epics that have not been added to a Milestone will sit. This allows you to drag and drop Epics from the Backlog to a Milestone. You can also drag to prioritize the Epics within the column, bringing the priorities to the top. This page can also be sorted by Team so you can see the Epics most relevant to you. Learn more in the Milestone Column View article.