General has one setting. It sets the width of the site. Open it at AppearanceCustomizeTheme DesignGeneral.
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Site Max Width (px)
Sets the maximum width of the site content, in pixels. The default is 1200. In the Boxed layout it also sets the width of the whole page. Pages that use the Full Width or Full Width, With Sidebar page layout ignore this setting. The preview reloads after you change it.
To switch between Full Width and Boxed, use Theme Settings > Layout.
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