NetBeans, like many IDEs, is separated into three panes. The left pane holds a project or file explorer. In the screenshot the left pane is empty because there's no project generated yet. The right pane is split between the content pane (showing a welcome page) and an info pane. The info pane will show things like the output from generators, scripts, etc. Anything you'd normally see on a console window will show up in the info pane.