How to make the theme unresponsive

You could either comment out or remove the responsive code at the bottom of your css file, or comment out or remove this code from your functions.php file –

// Add Viewport meta tag for mobile browsers
add_action( 'genesis_meta', 'epik_viewport_meta_tag' );
function epik_viewport_meta_tag() {
	echo '<meta name="viewport" content="width=device-width, initial-scale=1.0"/>';
}