woocommerce/plugins/woocommerce-blocks/assets/js/blocks/cart-checkout/checkout/style.scss

.wc-block-checkout__add-note,
.wc-block-checkout__keep-updated,
.wc-block-checkout__use-address-for-billing {
	margin-top: $gap;
}

@include breakpoint( ">480px" ) {
	.wc-block-checkout__billing-fields,
	.wc-block-checkout__shipping-fields {
		.wc-block-address-form {
			display: grid;
			grid-template-columns: 1fr 1fr;
			grid-column-gap: $gap-small;
		}

		.wc-block-address-form__company,
		.wc-block-address-form__address_1,
		.wc-block-address-form__address_2 {
			grid-column-start: span 2;
		}
	}
}