With Layout settings, you can set your Site width, Grid spacing, Rounding.
From Theme Settings -> Layout
1. Page
Page width: Allows you to set the maximum width that your online store will display in. This option will apply to all sections on the theme (except for sections that contain the option enable Fullwidth)
Space between template sections: You can adjust space between sections.
2. Grid Layout
This settings affect areas with multiple columns or rows.
3. Rounding
You can adjust the rounding for blocks, buttons, input field, ...
