Magento – I am unable to get checkout as guest in checkout page

There is two option

1. Allow Guest Checkout is No

Stores -> Configuration -> Sales -> Checkout -> Checkout Option

Allow Guest Checkout = No

Otherwise customise to sidebar.js

vendor\magento\module-checkout\view\frontend\web\js\sidebar.js

line no 63

 events['click ' + this.options.button.checkout] = $.proxy(function () {
            var cart = customerData.get('cart'),
                customer = customerData.get('customer'),
                element = $(this.options.button.checkout);

            if (!customer().firstname && cart().isGuestCheckoutAllowed === false) {
                // set URL for redirect on successful login/registration. It's postprocessed on backend.
                $.cookie('login_redirect', this.options.url.checkout);

                if (this.options.url.isRedirectRequired) {
                    element.prop('disabled', true);
                    location.href = this.options.url.loginUrl;
                } else {
                    authenticationPopup.showModal();
                }

                return false;
            }
            element.prop('disabled', true);
            location.href = this.options.url.checkout;
        }, this);