The Page settings box controls the layout of one page or post: sidebar, width, header, title and footer. It offers more options than the page templates. You find it in the right column of the edit screen.

Every setting starts on its default. A new page shows the top bar, header, title, footer widgets and both margins.
Settings
Page Layout
Sets the width and the sidebar. Default: Default.
- Default: content and sidebar, at the site width.
- No Sidebar: content only, at the site width.
- Full Width: content only, across the whole browser window.
- Full Width, With Sidebar: content and sidebar, across the whole browser window.
The sidebar appears only when the Sidebar widget area has widgets.
Top Bar
Shows the top bar on this page. Default: on. The top bar must also be on in AppearanceCustomizeTheme SettingsHeader.
Header
Shows the header on this page. Default: on. The header must also be on in AppearanceCustomizeTheme SettingsHeader.
Header Bottom Margin
Shows the space below the header. Default: on. Turn it off to put the first row of content against the header.
Page Title
Shows the page title. Default: on. The breadcrumb trail sits with the title, so it hides too. See Hide the Page Title.
Footer Top Margin
Shows the space above the footer. Default: on. Turn it off to put the last row of content against the footer.
Footer Widgets
Shows the footer widget area on this page. Default: on.