Collection Filter Grouping - Customizing the User Experience - shopify

Question

We would like to customize the collection group filtering. Currently, the group filtering is grouping and showing all product tags that have an underscore in the tag name.
ex: Brand_Premium
However, we would like to only show a filter group when there is more than one filter available within a group:
ex: All products on a given collection collection page are the same brand. In this case, we do not want to show a filter group for Brand, since there is only one option.
{%- capture tag_icon -%}
<span class="filter-icon--checkbox">
{%- include 'icon-checkbox' -%}
</span>
{%- endcapture -%}
{% for cat_item in cat_array %}
{% assign tag_count = 0 %}
<h3 class="productgrid--sidebar-title--small">
{{ cat_item }}
</h3>
<ul class="productgrid--sidebar-item filter-group">
{% for tag in collection.all_tags %}
{% assign cat = tag | split: '_' | first %}
{% if cat != tag and cat_item == cat %}
{% assign tag_count = tag_count | plus: 1 %}
{%- capture tag_text -%}
{{- tag_icon -}}
<span class="filter-text">
{{ tag | remove_first: cat | remove_first: '_' }}
</span>
{%- endcapture -%}
{% assign filter_class = 'filter-item' %}
{%- if current_tags contains tag -%}
{% assign filter_class = filter_class | append: ' filter-item--active' %}
{%- else -%}
{% assign filter_class = filter_class | append: ' filter-item--inactive' %}
{%- endif -%}
{%- if tag_count > tag_limit -%}
{% assign filter_class = filter_class | append: ' filter-item--hidden' %}
{%- endif -%}
<li
class="{{ filter_class }}"
data-tag-advanced
data-group="{{ cat_item }}"
data-handle="{{ tag | handle }}"
{% if tag_count > tag_limit %}data-hidden-default{% endif %}
{% if current_tags contains tag %}aria-current="true"{% endif %}
>
{% if current_tags contains tag %}
{{ tag_text | link_to_remove_tag: tag }}
{% else %}
{{ tag_text | link_to_add_tag: tag }}
{% endif %}
</li>
{% endif %}
{% endfor %}
{% if tag_count > tag_limit %}
<li class="filter-item">
<a class="filter-text--link" href="#" data-filter-toggle="false">
{{ 'general.general.see_more' | t }}
</a>
</li>
{% endif %}
</ul>
<hr />
{% endfor %}