Reminders on Mac not showing Sections.

I was trying Reminders on both IOS and Mac - e.g to manage a shared grocery list. On IOS the grocery list can be organized by Sections, but the same grocery list on the Mac has no sections. Same is true if I view the same grocery list on iCloud - no sections. Online help talks about commands in the File menu to add sections, but those commands do not appear on my Mac. Can anyone confirm how to get the Mac version of Reminders to show Sections?

Alternatively, are there pref files that I can delete to have Reminders recover its senses?

Mac OS: Monterey (12.7.1). Reminders v7 (2531.1)