first upload all files

Modules/Admin/Sidebar/AdminSidebar.php

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+<?php
+
+namespace Modules\Admin\Sidebar;
+
+use Maatwebsite\Sidebar\Menu;
+use Maatwebsite\Sidebar\Sidebar;
+use Nwidart\Modules\Facades\Module;
+use Nwidart\Modules\Contracts\RepositoryInterface as Modules;
+
+class AdminSidebar implements Sidebar
+{
+    /**
+     * The menu instance.
+     *
+     * @var \Maatwebsite\Sidebar\Menu
+     */
+    protected $menu;
+
+    /**
+     * Create a new sidebar instance.
+     *
+     * @param \Maatwebsite\Sidebar\Menu $menu
+     * @return void
+     */
+    public function __construct(Menu $menu)
+    {
+        $this->menu = $menu;
+    }
+
+    /**
+     * Get the built menu.
+     *
+     * @return \Maatwebsite\Sidebar\Menu
+     */
+    public function getMenu()
+    {
+        $this->build();
+
+        return $this->menu;
+    }
+
+    /**
+     * Build the sidebar menu.
+     *
+     * @return void
+     */
+    public function build()
+    {
+        $this->addActiveThemeExtender();
+        $this->addModuleExtenders();
+    }
+
+    /**
+     * Add active theme's sidebar extender.
+     *
+     * @return void
+     */
+    private function addActiveThemeExtender()
+    {
+        $theme = setting('active_theme');
+
+        $this->add("Themes\\{$theme}\\Sidebar\\SidebarExtender");
+    }
+
+    /**
+     * Add all enabled modules sidebar extender.
+     *
+     * @return void
+     */
+    private function addModuleExtenders()
+    {
+        foreach (Module::allEnabled() as $module) {
+            $this->add("Modules\\{$module->getName()}\\Sidebar\\SidebarExtender");
+        }
+    }
+
+    /**
+     * Add sidebar extender to the menu.
+     *
+     * @param string $extender
+     * @return void
+     */
+    private function add($extender)
+    {
+        if (class_exists($extender)) {
+            resolve($extender)->extend($this->menu);
+        }
+
+        $this->menu->add($this->menu);
+    }
+}

Modules/Admin/Sidebar/BaseSidebarExtender.php

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+<?php
+
+namespace Modules\Admin\Sidebar;
+
+use Modules\User\Contracts\Authentication;
+
+class BaseSidebarExtender
+{
+    protected $auth;
+
+    public function __construct(Authentication $auth)
+    {
+        $this->auth = $auth;
+    }
+}

Modules/Admin/Sidebar/SidebarExtender.php

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+<?php
+
+namespace Modules\Admin\Sidebar;
+
+use Maatwebsite\Sidebar\Item;
+use Maatwebsite\Sidebar\Menu;
+use Maatwebsite\Sidebar\Group;
+
+class SidebarExtender extends BaseSidebarExtender
+{
+    public function extend(Menu $menu)
+    {
+        $menu->group(trans('admin::sidebar.content'), function (Group $group) {
+            $group->weight(5);
+            $group->hideHeading();
+
+            $group->item(trans('admin::dashboard.dashboard'), function (Item $item) {
+                $item->icon('fa fa-dashboard');
+                $item->route('admin.dashboard.index');
+                $item->isActiveWhen(route('admin.dashboard.index', null, false));
+            });
+        });
+
+        $menu->group(trans('admin::sidebar.system'), function (Group $group) {
+            $group->weight(10);
+
+            $group->item(trans('admin::sidebar.appearance'), function (Item $item) {
+                $item->icon('fa fa-paint-brush');
+                $item->weight(15);
+                $item->route('admin.sliders.index');
+                $item->authorize(
+                    $this->auth->hasAnyAccess(['admin.sliders.index', 'admin.storefront.edit'])
+                );
+            });
+
+            $group->item(trans('admin::sidebar.tools'), function (Item $item) {
+                $item->icon('fa fa-wrench');
+                $item->weight(20);
+                $item->route('admin.importer.index');
+                $item->authorize(
+                    $this->auth->hasAnyAccess(['admin.importer.index'])
+                );
+            });
+        });
+    }
+}