The ui when you win a game is very distracting both at the start and end of a game and doesn't need to be there at all please leave it the way it was. This is a example of fixing something that isn't broken.
The site add/changes things occasionally and not everyone will like those changes. I've seen posts that also like this particular change.
That said, you can turn that off.
Settings > Board and Pieces and toggle Pre/Post Game Board Animation off and Save
The ui when you win a game is very distracting both at the start and end of a game and doesn't need to be there at all please leave it the way it was. This is a example of fixing something that isn't broken.