If no widgets are placed in a position, the entire area or row will not appear/collapse.
Configure at Admin Dashboard → Kirigami 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 IE6 Redirect.
Configure at Admin Dashboard → Kirigami Theme → Layouts the varying Mainbody/Sidebar layout possibilities.
Note: If no widgets are assigned 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 to learn how to add a new row of widget positions.