Magento – Magento2: Reset password custom email template

you need to add two line in xml

<remove name="right"/>
<remove name="left"/>

before your code

<reference name="head">
    <action method="setTitle" translate="title" module="customer">
        <title>Reset a Password</title>
    </action>
</reference>
<reference name="root">
    <action method="setTemplate">
        <template>page/1column.phtml</template>
    </action>
    <action method="setHeaderTitle" translate="title" module="customer">
        <title>Reset a Password</title>
    </action>
</reference>
<reference name="content">
    <block type="customer/account_changeforgotten" name="changeForgottenPassword" template="customer/form/resetforgottenpassword.phtml"/>
</reference>

It looks like Magento didn't add a config setting to override the default template like they have for all other templates (I've looked everywhere for this as well). In this case you'll need to copy

vendor/magento/module-customer/view/frontend/email/change_email.html

to your custom theme

app/design/frontend/YourPackageName/YourThemeName/Magento_Customer/email/change_email.html

Make the changes to that file then upload and flush cache + static files. Hopefully they'll add it to the Customers config settings in the future.