With Layout settings, you can set your Site width, Grid spacing, Rounding.
From Theme Settings -> Layout
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.
This settings affect areas with multiple columns or rows.
You can adjust the rounding for blocks, buttons, input field, ...