So, it is also important how the role of the coach will help how a player behaves. I think Ancelotti can do that and can change Mbappe's attitude, I mean he can give advice and direction to this player.
Yes, the role of the coach is very important, not only in the tactics and ability of the entire squad to carry out the game using their tactics, but also in how the coach controls the players to remain under his control. Yes, because there are some players who sometimes like what they do. Even worse, in some other clubs, there are many players who don't respect their coaches and sometimes even get into fights with them.
But at Real Madrid, with Ancelotti, that won't happen. However, Mbappe being at Real Madrid is his dream. And he really understands how big Real Madrid and Ancelotti's influence is on his club. This was very common during his time at PSG. Therefore, he will definitely be able to adapt well at Real Madrid, under coach Ancelotti.