Just to make sure, did you refresh the cache? (https://justinburch.com/cache-tips) If not, it can take a little bit of time for it to cascade. Additionally, you can try to Publish from the Portal Admin page.
Assuming you did all that, can you verify the following?
- Web Page has Page Template 'Full Page'

- Page Template has Web Template 'Full Page'

- Web Template Full Page has the below code, mostly focused on 'Child Navigation' being there & showdescriptions having 'true'
​{% extends 'Layout 1 Column' %}
{% block main %}
{% include 'Page Copy' %}
{% include 'Child Navigation' showdescriptions: true %}
{% if page.adx_entitylist %}
{% include 'entity_list' key: page.adx_entitylist.id %}
{% endif %}
{% if page.adx_entityform %}
{% entityform id: page.adx_entityform.id %}
{% endif %}
{% if page.adx_webform %}
{% webform id: page.adx_webform.id %}
{% endif %}
{% endblock %}
- Web Template 'Child Navigation' Exists with the below code
{% assign showchildren = showchildren | default: true %}
{% assign showdescriptions = showdescriptions | default: false %}
{% if showchildren and page.children.size > 0 %}
<div class="child-navigation content-panel panel panel-default">
<div class="panel-heading">
<h4>{% editable snippets "Page Children Heading" default: 'In This Section' %}</h4>
</div>
{% if showdescriptions %}
<ul class="list-group">
{% for node in page.children %}
<li class="list-group-item">
<h4 class="list-group-item-heading">
<a href="{{ node.url | escape }}">{{ node.title | escape }}</a>
</h4>
<div class="list-group-item-text">
{% case node.entity.logical_name %}
{% when 'adx_blog' or 'adx_event' or 'adx_webfile' or 'adx_webpage' %}
{{ node.entity.adx_summary}}
{% else %}
{{ node.entity.adx_description}}
{% endcase %}
</div>
</li>
{% endfor %}
</ul>
{% else %}
<div class="list-group">
{% for node in page.children %}
<a href="{{ node.url | escape }}" class="list-group-item">{{ node.title | escape }}</a>
{% endfor %}
</div>
{% endif %}
</div>
{% endif %}​
If any of this is different, can you share the differences? This code says that the Full Page template should be including the 'Child Navigation' template. The Child Navigation template says that if any template using it says 'showdescriptions: true', then it should create a list of child elements for the current page and, if it's a blog, marketing event, webfile or webpage, then it should use the summary field - otherwise, it should use the description field.