Whole website looks smaller on big monitors 14.0.0

[FloridaGlow]

Hi, this is the preview to my website: https://2y0bdqhvgwioazvk-57075630262.shopifypreview.com

It looks great and optimized mobile and laptops, but for big PC monitors like iMacs, it just looks small and there is empty space on the sides, how can I make the website much bigger adapted for the device it is on. It is Dawn 14.0.0.