If no widgets are placed in a position, the entire area or row will not appear/collapse.
Configure at Admin Dashboard → Fracture Theme, then go to Layouts to set the grid widths and allocated positions.
There are Gizmos that are injected into a site when enabled in the Administrator, and are stacked vertically.
These are the Google Analytics, Page Suffix, Smart Load Images, Typography Shortcodes, Page Class Suffix, RokStyle, Build Title-Spans, Disable Auto Paragraphs, Disable Texturize and IE7 Redirect.
Configure at Admin Dashboard → → Fracture Theme, then go to Layouts tab and set the varying Mainbody/Sidebar layout possibilities.
Note: If no widgets are placed to the Sidebar positions, the Mainbody will become full width.
To find out about Gantry Layouts and Widget Widths, check out this screencast which covers basic concepts of configuring layout with a combination of widget setting and the Gantry layout control.
Check out this quick screencast on Widget Positions to get an overview of how widget positions work within Gantry Framework. Click below button to learn how to add a new row of widget positions.