How to remove navbar?

Hello Team,

I am new bee on yii2.0 but i am developing own customised CMS in yii2.0. I have setup y112.0 advanced app. While on backend there is fix navbar appearing always which show Home and Login button. I want this navbar should not appear on login page it should appear only once the user will login. How I can do this?

Attached is screenshot for reference.

Have a look at "backend\views\layouts\main.php".