Show menus to one admin username

    function hide_menu() {
    global $current_user;
    $current_user = wp_get_current_user();
    $user_name = $current_user->user_login; 

        //check condition for the user means show menu for this user
        if(is_admin() &&  $user_name != 'USERNAME') {

        //your code here
   }
}
add_action('admin_head', 'hide_menu');