By default, the navigation menu on the left portion of the site is not displayed for the login pages. This page explains how to enable it and how to configure what is displayed in it.
The conf.php file under the .ht-inc directory of the web code needs to be modified. There are two items to work with:
To enable the navigation links, define NOAUTH_HOMENAV to be 1.
To control what items show up in the navigation list, modify the $NOAUTH_HOMENAV array. Each key in the array is the text that will show up in the navigation list. Each value in the array is what that item will link to.
This is what the login page looks like with the navigation links disabled:
This is what the page looks like with the navigation links enabled: