If someone needs search bar in primary menu and they can’t wait when that option is going be in Nirvana settings, you could implement search bar for yourself.
Paste this code into childs function.php
add_filter('wp_nav_menu_items','add_search_box_to_nav_menu', 10, 2);
function add_search_box_to_nav_menu( $items, $args ) {
if( $args->theme_location == 'primary' )
return $items.get_search_form();
return $items;
}
After that you need a style search form a little bit in childs style.css, but that its easy. You could style search bar in style.css by nav#access form#searchform
.
Example:
nav#access form#searchform {
float: right;
padding-top: 5px;
right: 15px;
max-width: 200px;
}
nav#access #searchform:after {
top: 5px;
}
nav#access #searchsubmit {
top: 5px;
}