You can change the left side navigation very easily by adding the below attribute to the body tag in the resources/views/layouts/master-layouts.blade.php file. data-layout="vertical" data-sidebar="dark" data-topbar="light" and comment out the code {{-- @include('layouts.hor-menu') --}} and uncomment this code @include('layouts.sidebar').

How to add new menu items/change menu items?

In order to add, change or remove menu items from the left side navigation, simply edit file resources/views/layouts/sidebar.blade.php. The change would reflect in all the blade files automatically. Note that if you add any menu in sidebar, you have to also add in hor-menu.blade.php file.