JA University Template is using css style to make template responsive, you can follow my below solution to deactivate it
+ Open templates/ja_university/etc/layouts/default.xml file
Find and remove it
<file media="only screen and (max-width:719px)">css/layout-mobile.css</file>
<file media="only screen and (max-width:479px)">css/layout-mobile-port.css</file>
<file media="only screen and (min-width:720px) and (max-width: 985px)">css/layout-tablet.css</file>
+ Open templates/ja_university/blocks/head.php file
Remove it
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=3.0, user-scalable=yes"/>
<meta name="HandheldFriendly" content="true" />
<?php if (T3Common::mobile_device_detect()=='iphone'):?>
<meta name="apple-touch-fullscreen" content="YES" />
<?php endif;?>
<?php if (T3Common::mobile_device_detect()):?>
<meta name="HandheldFriendly" content="true" />
<?php endif;?>
+ Remember to clear cache from Admin area after changing