Account settings can use earlier turns in a chat as context, so you do not re-explain the same project on every message.
It stays off until you turn it on in account settings.
A public page explains how to delete an account and that deletion is a soft-delete.
Upload documents and search them from chat, and personal and company libraries stay separate.
Upgrade, change, or cancel from the account page, and the public price is $10 a month.