With Layout settings, you can set your Page width, Grid spacing, and Corner radius.
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)

Affects areas with multiple columns or rows.
Horizontal space: Adjust the horizontal spacing between different components, such as navigation menus or icons. This helps balance the layout and ensures elements are not crowded together.
Vertical space: Adjust the vertical spacing between rows or different components, such as between the logo and the main menu. This helps create clear hierarchy and makes the header easier to read.

You can adjust the rounding for blocks, buttons, input field, ...