All Users View shows end-users with the most traffic in your network (from all domains).
To see this view, go to Top N > End Usersoption and select All Users node. Users are classified by Domains. Quickest way to find a user is to type its name or part of the name within a search tool. Search tool is at the upper right corner of the All Users node.
You can notice that user "Administrator" had significantly higher traffic then other users between 2pm and 3pm. Clicking on user "Administrator" will open single user's view, where you can deeply inspect his/hers traffic.