ACP2E-1323: Unable to Preview the email template

Author: thiaramus

app/code/Magento/Email/Block/Adminhtml/Template/Grid/Renderer/Action.php

@@ -25,7 +25,7 @@ public function render(\Magento\Framework\DataObject $row)
         $actions[] = [
             'url' => $this->getUrl('adminhtml/*/preview', ['id' => $row->getId()]),
             'caption' => __('Preview'),
-            'target' => 'blank'
+            'target' => '_blank'
         ];
 
         $this->getColumn()->setActions($actions);