Sample of adding/removing admin navigation items

gistfile1.txt

// Taken from \Admin\ServiceProvider::replaceNavMenuItem

AdminMenu::registerCallback(function (Navigation $manager) {
    // Change nav menu if single location mode is activated
    if (AdminLocation::check()) {
        $manager->mergeNavItem('locations', [
            'href' => admin_url('locations/settings'),
            'title' => lang('admin::lang.side_menu.setting'),
        ], 'restaurant');
    }
});