User Reports 'All Users' option not displayed

Hi,

User Reports seems to be working fine, however on the website the Usage section for the plugin shows an option to select 'All Users' as the user within the 'Reports' section under 'Users' when logged in via the Wordpress Network Admin panel; However from within my installation of this plugin I am only able to input 1 user to run a report on. I was under the impression I would be able to generate a single report of post activity for all users across the wordpress multisite installation.