diff --git a/core/modules/locale/src/Form/ExportForm.php b/core/modules/locale/src/Form/ExportForm.php
index ed2a6cf..8eaa9fd 100644
--- a/core/modules/locale/src/Form/ExportForm.php
+++ b/core/modules/locale/src/Form/ExportForm.php
@@ -85,7 +85,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
       $form['content_options'] = array(
         '#type' => 'details',
         '#title' => $this->t('Export options'),
-        '#collapsed' => TRUE,
+        '#open' => FALSE,
         '#tree' => TRUE,
         '#states' => array(
           'invisible' => array(
diff --git a/core/modules/system/tests/modules/form_test/src/Form/FormTestVerticalTabsAccessForm.php b/core/modules/system/tests/modules/form_test/src/Form/FormTestVerticalTabsAccessForm.php
index bab4d19..194d39d 100644
--- a/core/modules/system/tests/modules/form_test/src/Form/FormTestVerticalTabsAccessForm.php
+++ b/core/modules/system/tests/modules/form_test/src/Form/FormTestVerticalTabsAccessForm.php
@@ -24,7 +24,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
     $form['tab1'] = array(
       '#type' => 'fieldset',
       '#title' => t('Tab 1'),
-      '#collapsible' => TRUE,
+      '#open' => TRUE,
       '#group' => 'vertical_tabs1',
     );
     $form['tab1']['field1'] = array(
@@ -35,7 +35,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
     $form['tab2'] = array(
       '#type' => 'fieldset',
       '#title' => t('Tab 2'),
-      '#collapsible' => TRUE,
+      '#open' => TRUE,
       '#group' => 'vertical_tabs1',
     );
     $form['tab2']['field2'] = array(
@@ -77,7 +77,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
     $form['tab3'] = array(
       '#type' => 'fieldset',
       '#title' => t('Tab 3'),
-      '#collapsible' => TRUE,
+      '#open' => TRUE,
       '#group' => 'vertical_tabs2',
     );
     $form['tab3']['field6'] = array(