If you wish to enhance your administration area, built with Filament Admin, with a custom favicon, you can follow the steps below.
Place the desired favicon (in this example we use "admin_favicon.ico") in the project path under /public.
boot() method of the file /app/Providers/FilamentServiceProvider.php, add the following code:
Filament::pushMeta([ new HtmlString('<link rel="icon" type="image/x-icon" href="/admin_favicon.ico">'), ]);
Once these changes have been made, the new favicon will be displayed.