Real Madrid will definitely prevent Mbappe's ego. Ancelotti is a great coach and resolving situations like this is his specialty. I'm sure he thought about these during Mbappe's transfer because Mbappe had great tolerances in PSG. Their privileges over other players were obvious. I know, like everyone else, that this will not happen in Real Madrid.
I also think that this kind of ego thing from Mbappe was already thought about by Real Madrid when they wanted to recruit him into the Real Madrid squad. And what you say is also true that Carlo Ancelotti can definitely handle things like that at Real Madrid and keep the atmosphere peaceful between all the players. Because Ancelotti not only has experience in training any player, but also has a way of not giving birth to any ego in any player he trains.
Yes, every team must be able to lower their egos because playing for the team, not for yourself, will of course produce a good game if you play for the team. I'm not too happy with Mbappe's ego at PSG, but I don't know if he can do that at Madrid, whereas all the players are considered special. and it's the same with Ancelotti, so there doesn't have to be anything special, it's very important to be able to maintain team harmony well when playing in domestic league competitions and in European league competitions.
Entering Madrid's main squad and perhaps Ancelotti will continue to play as a striker there, of course this will see whether his ego playing for this team will be the same as when he played for PSG, that's why it's a bit difficult for him to win the UCL trophy because he can't control his ego at PSG, hopefully Madrid will make Mbappe learn a lot that teamwork is important and that you must maintain harmony and approach towards all players and lower your ego so that you can continue to play well against all opponents. Hopefully Ancelotti can handle Mbappe's ego in Madrid later.