When I worked there we didn’t have the fireworks package but I can only assume that the seats available for that are the lower deck tables, which have the unobstructed view of the fireworks. So you watch the fireworks from your table. Other diners were not allowed to come stand around in that area when I worked there, and I’d assume that would be the case even more so now that it is a paid for package!
Other diners have the choice to stay at their table (some other parts of the restaurant with obstructed views) or going to a separate viewing area which is reserved for diners of the R&C