Follow this method How to Remove WordPress Twenty Eleven's Responsive Structure. If you're using the WordPress Twenty Eleven theme and want to remove its responsive structure then you have come to the right blog. 
Disable WordPress TwentyEleven's responsive structure


The smart way to edit Twenty Eleven is to use a child theme, so create one if you haven’t done so.

Step 1

In the child themes’ header.php, remove the <meta name=”viewport” content=”width=device-width” />

Twentyeleven’s header.php –
…
<head>
<meta charset="<?php bloginfo( 'charset' ); ?>" />
<meta name="viewport" content="width=device-width" />
<title>
…

Twentyeleven child theme’s header.php –
…
<head>
<meta charset="<?php bloginfo( 'charset' ); ?>" />
<title>
…

Step 2

In the child theme’s style.css remove the max-width property of the #page element and replace it with width.

twentyeleven’s style.css –
#page { max-width: 1000px; }

twentyeleven child theme’s style.css
#page { width: 1000px; }

Here’s a snapshot of Twenty Eleven’s code and the child theme’s code that removes the responsive structure.