I think you’ll need to override the component partial in order to do this, so assuming that you’re on a child theme based on Orange, you can go to edit the theme, select “Pages” and “Checkout [checkout/checkout]” and then on the “Checkout Component” card click the button for “Override Component Partial” and pick address fields in the modal. Once you’ve done that you’ll see “[checkout/address_fields]” in the “Partials” list, where you can edit the form fields that get displayed at checkout.