If the browser window for the docs gets narrow enough the left hand menu gets moved into a burger menu in the top nav, that can be toggled with a click.
The links in this menu are missing a leading slash, so they are wrong when already on a subpage.
Example Code:
<li class="toctree-l2">
<a class="reference internal" id="Installing Workflow" href="installing-workflow/">Installing Workflow</a>
</li>
The proper href would be "/installing-workflow/" so that it works on subpages.