Hi there,
I am sorry for the inconvenience. Currently, we're in the midst of updating our documentation and unfortunately, there is no available documentation for you.
Anyways, regarding your inquiry,
> For Navigation menu, where can I configure it?
It is actually rendered by mod_office_sidebar module. Each of the navigation menus there will automatically displayed/hidden whenever you've enable/disable any feature in EasySocial. For example, if you've disable video feature in EasySocial, the "Video" menu will automatically hidden from the menu listing.
Currently, there is no available settings for you to configure. However, if you wish to customize this, I'd advise to create a template override of mod_office_sidebar to prevent your changes being overwritten when updating the template to latest in the future.
/modules/mod_office_sidebar/tmpl/default.php
Hope this helps.
Thanks.