How can I be able to view the staging site without being logged in?
I’d like to show the client the site without having them to log in.
in that case, just disable the wp staging plugin from wp-admin > plugins or by renaming the plugin folder
For the latter, you need an FTP program like Filezilla or you need to install a file manager plugin on your production website.
You can also disable WP Staging authentication at all from WP Staging > settings
If you do that you need to create a new staging site. Enabling this setting will not affect already existing staging sites.