Non logged in users cannot see appointments

I am in the process of configuring the plugin and thought that everything was going well as I could see the appointments when I applied the shortcodes.

However, when I emailed my client to take a look they couldn't see anything as they weren't logged in to WordPress. This means that their clients wouldn't be able to see or book any appointments either.

Looking through the documentation I can see the setting 'login required' and I have set it to 'No', but this hasn't made a difference.