默认的

app/admin/controller/user/User.php

@@ -882,7 +882,7 @@ class User extends AuthController
     {
 
         $this->assign([
-            'content' => sys_config('member_content', ''),
+            'content' => sys_config('member_content'),
             'field' => 'description',
             'action' => Url::buildUrl('change_member_content', ['field' => 'description'])
         ]);