Yes, you will receive a separate email confirmation, pre-stay email, and any other transactional email for each reserved stay in your cart after checkout. Each confirmation email will be specific to the reservation and the campground and include important information such as reservation number and campground-specific cancellation policy.
That doesn't mean this area has to always be empty. When you start reviewing camping options, your history will display here to help compare sites and find the best stay. You will be able to share your stay information with friends or family and save it for a later time if you have a KOA Account.