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Settings → Checkout design controls how every checkout for your business looks. The preview on the right updates as you make changes, and the changes apply to all checkout links and checkout sessions when you save.
Branding, Editing, and Theme settings on the Checkout design page

Branding

Theme and colors

Checkout starts on the Kelviq theme. Change any color and it becomes Custom. Light and dark mode each have their own set of colors. Under Editing, pick which one you’re changing. This only affects the editor, not what customers see.
The Editing toggle, theme picker, and brand colors

The same checkout in light and dark mode
Keep enough contrast between Primary and Primary text. The button label sits on the primary color.

Shape

Set how rounded cards, buttons, and inputs are. Tick Link card, button, and input radius to use one value for all three, or untick it to set Corner radius, Button radius, and Input radius separately.

Default mode

Choose how checkout opens: Match buyer’s device, Light, or Dark. Customers can still switch modes themselves from the corner of the page.

Choose what customers see

Under Visibility, turn sections of checkout on or off. Everything is on by default except Metered features.
The Visibility checklist with every section on except metered features
Hiding the plan selector only hides the list. Checkout still uses the plan from the link. To hide the discount field for one link rather than every checkout, add discounts_enabled=false to the checkout URL.