The desktop screen look more like on a tablet
By default, Shopify will need to reserve some space for the editor, which can take up anywhere from 30% to 40% of your screen width. So, for small screens like a 13-inch macbook, the content inside the preview will not display properly as outside the desktop page.
The most convenient way to customize your theme is that you can use 2 browser tabs, one to change in the Shopify Editor and one to preview the desktop.
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