Create a link in side navigation

The CMS Questions
2

You can do that via the panel.menu option:

<?php
use Kirby\Cms\App;

return [
	'debug' => true,
	'panel' => [
		'menu' => [
			'site',
			'system',
			'users',
			'-',
			'about' => [
				'icon'    => 'pen',
				'label'   => 'About',
				'link'    => 'pages/about',
				'current' => function (): bool {
					$path = App::instance()->request()->path()->toString();
					return Str::contains($path, 'pages/about');
				},
			],
		],
	],
];

There seems to be something not quite working as expeacted, as when using this example, the site item is always active as well when about is active.

Edit: ok, for this case to work properly, you have to redefine current for site as well:

		'site' => [
				'current' => function (): bool
				{
					$path = App::instance()->request()->path()->toString();
					return Str::contains($path, 'site');
				},
			],

Also note that you have to list all menu entries with this approach, items not listed will disappear from the side nav.