wordpress change/add post types on default theme search

functions.php

add_filter('pre_get_posts','search_filter', 99); //use 99 to override/priorize this filter
function search_filter( $query ) 
{
    if ( $query->is_search ) 
    {
      //use this for more than one post type;
      $query->set( 'post_type', array('post','page','jobpost') );
      
      //use this (uncomment) for only one post type
      //$query->set( 'post_type', 'post' );
    }
    return $query;
}