Missing 'Export' option in Reminders menu on macOS Mojave or earlier

I am trying to export a Reminders list on a mac.

I found these instruction in Apple Support : 108306

1. Open Reminders.
2. Go to the reminder list that you want to export.
3. Choose File > Export.
4. Enter a name, choose a location, and then click Export.

But File> Export does not exist in the menu.

Is it me or what?

What don't I understand?

[Re-Titled by Moderator]

Original Title: Export a Reminders list on a mac. I found these instruction in Apple Support : Reminders Export a copy of your Reminders on your Mac with macOS Mojave or earlier: Open Reminders. Go to the reminder list that you want to export. Choose