Module Positions Diagram
If no modules are published to a position, the entire area or row will not appear/collapse.
There are Features that are injected into a position when enabled in the Administrator, and are stacked vertically.
These are the Logo, Date, Font Sizer, Login Panel, Popup Model, RocketTheme Branding, Copyright, Top Top Scroller, System Messages and Reset Settings.
To find out about Gantry Layouts and Module Widths, check out this screencast which covers basic concepts of configuring layout with a combination of module setting and the Gantry layout control.View : Using Gantry Layouts
Check out this quick screencast on Module Positions to get an overview of how module positions work within Gantry Framework. Click below button to learn how to add a new row of module positions.Learn : Adding Module Positions