magento-test/app/code/Magento/Contact/etc/adminhtml/system.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <section id="contact" translate="label" type="text" sortOrder="100" showInDefault="1" showInWebsite="1" showInStore="1">
            <label>Contacts</label>
            <tab>general</tab>
            <resource>Magento_Contact::contact</resource>
            <group id="contact" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                <label>Contact Us</label>
                <field id="enabled" translate="label" type="select" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                    <label>Enable Contact Us</label>
                    <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                    <backend_model>Magento\Contact\Model\System\Config\Backend\Links</backend_model>
                </field>
            </group>
            <group id="email" translate="label" type="text" sortOrder="50" showInDefault="1" showInWebsite="1" showInStore="1">
                <label>Email Options</label>
                <field id="recipient_email" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                    <label>Send Emails To</label>
                    <validate>validate-email</validate>
                    <depends>
                        <field id="*/contact/enabled">1</field>
                    </depends>
                </field>
                <field id="sender_email_identity" translate="label" type="select" sortOrder="20" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                    <label>Email Sender</label>
                    <source_model>Magento\Config\Model\Config\Source\Email\Identity</source_model>
                    <depends>
                        <field id="*/contact/enabled">1</field>
                    </depends>
                </field>
                <field id="email_template" translate="label comment" type="select" sortOrder="30" showInDefault="1" showInWebsite="1" showInStore="1" canRestore="1">
                    <label>Email Template</label>
                    <comment>Email template chosen based on theme fallback when "Default" option is selected.</comment>
                    <source_model>Magento\Config\Model\Config\Source\Email\Template</source_model>
                    <depends>
                        <field id="*/contact/enabled">1</field>
                    </depends>
                </field>
            </group>
        </section>
    </system>
</config>