Modular Pages: How to set default all modular pages to "onpage_menu: false"?

{% extends 'partials/base.html.twig' %}

{% block hero %}
    {% for module in page.collection() if module.template == 'modular/hero' %}
        <div id="{{ _self.pageLinkName(module.menu) }}"></div>
        {{ module.content }}
    {% endfor %}
{% endblock %}

{% block body %}
    <div style="margin-bottom: 122px;"></div>
    {% for module in page.collection() if module.template != 'modular/hero' %}
        <div id="{{ _self.pageLinkName(module.menu) }}"></div>
        {{ module.content }}
    {% endfor %}
    <div style="padding-left: 1.4rem;">
      {# check to display CC License - hibbittsdesign.org #} {# check to display git sync link in page - hibbittsdesign.org #}
      {% if theme_var('display_of_git_sync_repo_link') == 'page' and not (grav.uri.param('summaryonly')) %}
        {% include 'partials/git_sync_repo_link_note.html.twig' %}
      {% endif %}
      {% if theme_var('cc_license.enabled') %}
        {% include 'partials/creative_commons_license.html.twig' %}
      {% endif %}
    </div>
{% endblock %}