After the installation process is finished, in order to properly register the service provider and alias, you should insert the following lines into the config/app.php file:

'providers' => ServiceProvider::defaultProviders()->merge([
    // ...
    BarryvdhDomPDFServiceProvider::class,
],

'aliases' => Facade::defaultAliases()->merge([
    // ...
    'PDF' => BarryvdhDomPDFFacade::class,
],

However, it is important to note that an error may occur indicating that ‘BarryvdhDomPDFFacade’ is an Undefined type.

I have verified that the domPDF package has been successfully installed.