I found this on the Celebrity web site
Celebrity Select Dining Early and Late on Edge Series
We may have reinvented the main restaurant experience, but we haven’t changed the way you plan your dining in our main restaurants. You can choose Celebrity Select Early or Late seating for your dining times, which allows you to enjoy dinner at the same table with the same waiter every evening. You’ll be assigned one of the four main dining restaurants while having the option to dine in the other three upon request.
You’ll receive notice in your stateroom on embarkation day for confirmation of your restaurant, table number, and waiter.