Try to add the following code snippet to the Custom CSS area in Theme Settings to fix this issue.

@media (min-width: 768px) {
	body .wcf-embed-checkout-form.wcf-embed-checkout-form-modern-checkout .wcf-customer-info-main-wrapper {
		width: 60%;
	}
	
	body .wcf-embed-checkout-form.wcf-embed-checkout-form-modern-checkout .woocommerce-checkout {
		flex-wrap: nowrap;
		gap: 0;
	}
}