Folder containing template content
Specifies the relative Document System path beneath the root of the content folder hierarchy (@) to the folder that contains the content records that define the content areas of a template. Use the format @/etc/etc. You can use this field to reuse customizations you might have made to the content area files for another website that shares the same template design, which spares you maintaining multiple sets of the same customized content records.
MasterPage/Template to use for the site’s layout
Specifies the ASP.NET master page to use for the layout of the entire website or special types of website pages as indicated by the field name. You can use this site's layout field to reuse a customized master page among several different websites, rather than maintain multiple versions of the same customized master page. The master pages shown in the list are the contents of the ~/Templates/MasterPages folder.
Theme (colors, fonts, etc.) to use for the site's "look and feel"
Specifies the ASP.NET theme to use for the visual look and feel of the website. You can use this field to reuse a customized theme among several different websites, rather than needing to maintain multiple sets of the same customized theme files. The themes shown in the list are the contents of the ~/App_Themes folder.
MasterPage/Template to use for "Print this page" type functionality
Specifies the layout to use to render print-friendly page
views, such as called by the printer icon:
MasterPage/Template to use for Text Only requests
Specifies the layout to use to render text-only page views,
such as called by the text icon: 
MasterPage/Template to use for Pop-up windows
Specifies the layout to use to render pop-up windows, such
as used by the “Send this page” icon: 
Use breadcrumbs on this site
Enables breadcrumbs (the hierarchical path of links to the current content) that appears directly between the global navigation and the page contents.