The Table tab shows all the objects related to the TimeTracker app. When you select an object from the list, it shows the data related to the selected object.
In short, this is a report kind of screen.
e.g.: If you select the TT User object in the list, you see all the TT users created in your org.
The table tab shows some default fields in the list, click the Configure Pivot option to add or remove the fields from the list.