Pages

This section sets the default layout for new pages.  You may find it easier to skip this section, and instead set the layout for invidual pages while previewing them.

Within Site settings > Template > Template builder > Pages, you can set the default layout for each page type.  These are as follows:
 
TECHNICAL NOTE:
When the Apply to all... option is checked within any individual page, the settings from that page are also applied here.