Multiple layouts
Layout enables you to create various structures and satisfy any specific styles for various types of businesses.
From your Shopify admin, go to Online Store -> Themes.
Find the theme that you want to edit, and then click Customize.
Click Theme Settings -> Layout.
Section width
Select the section width from the dropdown menu:
Full width: Set the width of the section to be full of the viewport.
Page width: Set the width of the section to page width.
Page width
Determines the default width of page layout. Can be from 1000px to 1800px, increasing arithmetically of 100px (pixel).
Full width
Padding left/right of layout
Determines the distance from the body container to both sides of the browser.
Grid
Affects areas with a multicolumn layout.
Horizontal space
Determines the horizontal spacing between columns on multicolumn layout. Can be from 0px to 40px, increasing arithmetically of 1px (pixel).
Vertical space
Determines the vertical spacing between columns on multicolumn layout. Can be from 0px to 40px, increasing arithmetically of 1px (pixel).