app/views/search_results/sections/_mode.html.erb

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<div class="form-group">
  <%= label_tag :qt, t('txt.views.search_results.mode') %>
  <%= select_tag :qt, options_for_select([
                                           [t('txt.views.search_results.contains'), 'contains'],
                                           [t('txt.views.search_results.exact'), 'exact'],
                                           [t('txt.views.search_results.ends_with'), 'ends_with'],
                                           [t('txt.views.search_results.begins_with'), 'begins_with']
                                         ], params[:qt]), :class => 'form-control' %>
</div>