Hi @Angela Salunga,
Yes it does, at least when you are in a space. Maybe you are at the Home page of your Confluence site or the navigation bar may have been collapsed.
In the first scenario, navigate to any space or page and you should see the navigation/tree appear on the left hand side. In the second case, either press the "[" key on your keyboard to expand the navigation or look for this icon near the top left of your screen:
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