View Staging Site Without Being Logged in

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 /staging-site/wp-content/wp-staging-pro

For the latter, you would need a FTP program like Filezilla to do so.