fcuntions.php

add_action( 'get_header', 'dt_media_sidebar', 10 );

function dt_media_sidebar() {

	$config = Presscore_Config::get_instance();
	
	if(is_singular( 'post' )){
		$config->set( 'sidebar_position', 'left'  );  //to change sidebar postion
		$config->set( 'sidebar_widgetarea_id', 'sidebar_1' ); //repalce with sidebar widget area id
	}	
}