When you start Workbench, or open a project in Workbench, it opens to the Project tab. The Project tab is the main workspace where you build your analysis.
Like all tabs, the Project tab is made up of different panes that can be reconfigured according the information you want to see. By default, the Project tab has the Toolbox pane and the Project Schematic pane.
You can start adding systems to the Project Schematic immediately or you can create, open, or import a project.