Question: Do players change seats during after each Mah Jongg game?

Answer: Yes, they do. In a four-player game, East is what the league refers to as the original East or “the pivot for the day.” East rolls the dice to break the wall and the dice are given to the player on their right, and so on. After completing four games (i.e., round) and the dice arrive at the original East (i.e., pivot), East keeps the dice and switches seats (i.e., pivots) with the player to their right. This process repeats for the playing session.

Source: Mah Jongg Made Easy (2020 page 27, para 1)