netbox-community-netbox/netbox/templates/ipam/inc/toggle_available.html

{% load helpers %}
{% if show_available is not None %}
  <div class="btn-group m-1" role="group">
    <a href="{{ request.path }}{% querystring request show_available='true' %}" class="btn btn-sm btn-outline-secondary{% if show_available %} active disabled{% endif %}">
      <i class="bi bi-eye-fill"></i> Show Available
    </a>
    <a href="{{ request.path }}{% querystring request show_available='false' %}" class="btn btn-sm btn-outline-secondary{% if not show_available %} active disabled{% endif %}">
      <i class="bi bi-eye-slash-fill"></i> Hide Available
    </a>
  </div>
{% endif %}