app/views/promethee/edit/_inspect_advanced.html.erb
<hr>
<div class="btn btn-default btn-default btn-light btn-sm" ng-click="advancedConfigurationOpen = !advancedConfigurationOpen">
Advanced configuration
<%= icon('fa', 'angle-down', 'ng-class': "{'fa-rotate-180': advancedConfigurationOpen}") %>
</div>
<br><br>
<div ng-show="advancedConfigurationOpen">