plugins/CustomVariables/templates/manage.twig

{% extends 'admin.twig' %}

{% block topcontrols %}
    <div class="top_bar_sites_selector piwikTopControl">
        <div
            vue-entry="CoreHome.SiteSelector"
            show-selected-site="true"
            class="sites_autocomplete"
        ></div>
    </div>
{% endblock %}

{% block content %}
    <div vue-entry="CustomVariables.ManageCustomVars"></div>
{% endblock %}