You can add a layout to your app at any time.
GXW uses the first layout by default.
To add a layout:
While editing your app in Web Designer, click beside the current layout tab.
The Add New Layout window appears.
In the Title box, type a new title for the layout.
Select one of the following options:
Copy current layout: The new layout will be a copy of the current layout.
New blank layout: The new layout will be blank.
Click Add.
The new layout is added and becomes the current layout being edited.
Click File | Save.