Make security zones more obvious and easier to use

Probably put them as a full-sized icon on the home ribbon

Plus, review terminology as I am unclear where the "Guest Checkout user" fits in - is this anonymous or logged in? the configuration choices for the checkout section are unclear. Perhaps we need a specific, additional default zone of "Guest or logged in user" that allows logged in as the guest contact.

Plus, there seems some confusion over the default zones as they aren't showing all the options? is this a bug? or does it just require explanation?