This is the container that represents a Release
Items, which primarily include Epics and Stories of different types, can be added via drag and drop from Preplanned lists, Kanban lane, Sprint and generally the left pane. The same items can be reordered while in the Release. Once items are added to a Release, they can be removed using the option Remove from release in their context menus.
Sprints can be added to the Release from the Release’s context menu. The items can also be dragged out.
Once a Release is ready start working with, it can be activated from its context menu too. The opposite is also possible.