when does right_column show up?

I am studing almost every file for a big modification.
 
But I am confused about:
\app\View\Elements\right_column.ctp
 
When does this file be show up? The variable is set in two files UsersController.php and AppController.php
            $this->set('no_right_column', true);
 
I could try to comment the set out, because of empty($no_right_column)
 
But I am not sure if it is useful, can someone answer my question or just post a screenshot when it's shown?
Posted in Developer on 05/09/16 at 17:04
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