We did this dinner on Edge last month. There was one day where we were in port until 11 pm, and it was held that night. They stagger arrival times in either 15- or 30-minute increments, beginning at 6 pm. The early arrivals obviously were assigned the table right next to the edge of the platform, and then there was another row of tables next to those - most of them were tables for two, and the later arrivals were seated there.
I've attached the menu used on our sailing. They serve each of the appetizers in sequence, and then the entrees served on a platter family-style, and then all 3 desserts as a sampler with a plate for each guest.
Honestly, we weren't as impressed as we expected. The setting was incredible, and the service was of course wonderful. But the food was just so-so. They use the pool-burger restaurant (Waves?) around the corner for staging and cooking, and most of the food came out lukewarm at best. We're glad we did it, but we canceled our reservation for our May cruise on Beyond. The food and menu in Luminae were superior. Your call if it's worth a try, but think about the cost and what you'd get in a land-based restaurant for that amount.
If you have another specialty restaurant booked, it's on you to cancel or re-schedule it. Let me know if you have other questions. (We found scant info when we were deciding last year.)