At the left of the project page, there’s a collapsible navigation sidebar so you can make more space for your stories. You can leave the sidebar open all the time, or if you need more space, click the sidebar toggle
at the top left to collapse it. When the sidebar is collapsed, mousing over the control auto-expands the sidebar until you mouse away. Or, click the control again to toggle the expanded sidebar back on.
Expanded sidebar Collapsed sidebar