General has one setting. It needs Puro Premium. Go to AppearanceCustomizeTheme DesignGeneral.
Site Max Width (px)
The maximum width of the site, in pixels. Default: 1080. Enter a smaller or larger number.
Site Max Width needs Responsive Layout to be on to make the site wider. With Responsive Layout off, the page keeps a fixed width, so a larger value has no effect. See Layout.
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