Sorry to disappoint, but they don't have one. While you can usually get to what you think would be a good view, just before the show all the CMs get everyone up onto their feet and moving forward to fill in all the spaces so everyone can get a view. Yeah, great. Except those of us in wheelchairs and mobility scooters. And when the kids go up on shoulders right in front of you, forget about getting a clear view of the castle projections.
Sorry, am I sounding a bit bitter? We saw Happily Ever After twice. The first viewing was ruined by a said child on someone's shoulders, even though the family next to me helped me find a space I could stand up in so I'd be able to see, and the second time I had a family behind me moaning constantly because we'd just turned up and gone into the gap which was in front of them and their little'un couldn't see, even though there were a load of people standing in front of us, too. As a result I felt guilty about standing up for a good view so stayed sitting down and didn't get any decent unobstructed photos that viewing, either.
Trouble is, if you get right at the front (which is possible if you're prepared to stake your spot at least an hour before the show starts), you're then too close to see the fireworks properly - and they project right out onto all the castle bits out to the side of the castle as well. If you stay well back, eg down by the restrooms near Tomorrowland Terrace, you get a fantastic view of the fireworks (we've watched Wishes from there more than once), but can't see any of the projections at all.