diff --git a/modules/crm_core_match/src/Plugin/crm_core_match/engine/DefaultMatchingEngine.php b/modules/crm_core_match/src/Plugin/crm_core_match/engine/DefaultMatchingEngine.php
index f8c92ad..1139858 100644
--- a/modules/crm_core_match/src/Plugin/crm_core_match/engine/DefaultMatchingEngine.php
+++ b/modules/crm_core_match/src/Plugin/crm_core_match/engine/DefaultMatchingEngine.php
@@ -181,11 +181,13 @@ EOF
     ];
 
     $form['unsupported'] = [
+      '#type' => 'details',
+      '#title' => $this->t('Unsupported Fields'),
+      '#open' => TRUE,
       // Hide table when empty. We set this to TRUE as soon there is at least
       // one unsupported field.
       '#access' => FALSE,
       'table' => [
-        '#title' => $this->t('Unsupported Fields'),
         '#theme' => 'table',
         '#header' => [
         'label' => $this->t('Name'),