I want to remove only text on checkout page "You can create an account after checkout"
2 Answers
You need to override template in below path inside your custom theme.
app/design/frontend/vendor/theme/Magento_Checkout/web/template/form/element/email.html
<!--
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
-->
<!-- ko ifnot: isCustomerLoggedIn() -->
<!-- ko foreach: getRegion('before-login-form') -->
<!-- ko template: getTemplate() --><!-- /ko -->
<!-- /ko -->
<form class="form form-login" data-role="email-with-possible-login"
data-bind="submit:login"
method="post">
<fieldset id="customer-email-fieldset" class="fieldset" data-bind="blockLoader: isLoading">
<div class="field required">
<label class="label" for="customer-email">
<span data-bind="i18n: 'Email Address'"></span>
</label>
<div class="control _with-tooltip">
<input class="input-text"
type="email"
data-bind="
textInput: email,
hasFocus: emailFocused,
mageInit: {'mage/trim-input':{}}"
name="username"
data-validate="{required:true, 'validate-email':true}"
id="customer-email" />
<!-- ko template: 'ui/form/element/helper/tooltip' --><!-- /ko -->
</div>
</div>
<!--Hidden fields -->
<fieldset class="fieldset hidden-fields" data-bind="fadeVisible: isPasswordVisible">
<div class="field">
<label class="label" for="customer-password">
<span data-bind="i18n: 'Password'"></span>
</label>
<div class="control">
<input class="input-text"
data-bind="
attr: {
placeholder: $t('Password'),
}"
type="password"
name="password"
id="customer-password"
data-validate="{required:true}" autocomplete="off"/>
<span class="note" data-bind="i18n: 'You already have an account with us. Sign in or continue as guest.'"></span>
</div>
</div>
<!-- ko foreach: getRegion('additional-login-form-fields') -->
<!-- ko template: getTemplate() --><!-- /ko -->
<!-- /ko -->
<div class="actions-toolbar">
<input name="context" type="hidden" value="checkout" />
<div class="primary">
<button type="submit" class="action login primary" data-action="checkout-method-login"><span data-bind="i18n: 'Login'"></span></button>
</div>
<div class="secondary">
<a class="action remind" data-bind="attr: { href: forgotPasswordUrl }">
<span data-bind="i18n: 'Forgot Your Password?'"></span>
</a>
</div>
</div>
</fieldset>
<!--Hidden fields -->
</fieldset>
</form>
<!-- /ko -->
A slightly simpler solution if you have created your own child theme is to remove it with css:
app/design/frontend/vendor/theme/web/css/source/_theme.less
#customer-email-fieldset .note span { display: none; }