You can  Configure the Sidebar to make it easier to navigate through your space.

• The space shortcuts section of the sidebar lets you link to important content. You can use this to highlight pertinent pages within your space, related content from other spaces, or to external content that is relevant to your space.
• The navigation display lists all of the pages in your space in either a page tree or child pages format. If you only want some content to be visible in the sidebar, you can hide the navigation display and put the pages you want to remain visible under Space shortcuts instead.