The default view in the Interface Builder is the layouts view, as shown in Displaying the layouts in the Interface Builder. You use this view to specify the entire GUI, with the exception of the menus. Click the Layouts tab to swap to this view from any other in the Interface Builder.
Figure 19.4 Displaying the layouts in the Interface Builder
The Interface Builder has three sections in the layouts view.
LispWorks IDE User Guide (Windows version) - 25 Nov 2011