Delete 'search' input from menu navigation?

Delete ‘search’ input from menu? (canvas off)

With:

.shelf-search{display:none;}

I went invisible with css but I need to remove the canvas off
looked everywhere but I found the file

Regards!

http://i.imgur.com/y11kjUo.png

http://ww.wp.xz.cn/plugins/apppresser/