For 1 you can add this css:
.kad-topbar-left, .kad-topbar-right {
width: 100%;
}
2. by next I see that you have the search to the left of your title? are you wanting it different? You can’t really add it as part of the title it would need to be in a sidebar or widget area.
Kadence Themes
For 1 it works – thank you.
For 2 I used this code:
add_filter('wp_nav_menu_items', 'add_search_form_to_menu', 10, 2);
function add_search_form_to_menu($items, $args) {
// If this isn't the main navbar menu, do nothing
if( !($args->theme_location == 'primary_navigation') )
return $items;
// On main menu: put styling around search and append it to the menu items
return $items . '<li class="my-nav-menu-search">' . get_search_form(false) . '</li>';
}