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Real Madrid should not be expecting such impact from Mbappe straight away. Mbappe is still adapting to Spanish football. The football is very different. Ronaldo had problems adapting to the la liga when he moved from the premier league to join Real Madrid. Neymar struggled in PSG compared to he was in the Spanish League.
I don't think the coach is that much worried about Mbappé's performance because he knows it's just a matter of time. It may be due to adaptation—meaning he might not have fully adapted to La Liga's playing style yet. However, Mbappé is still doing well; he is not playing badly. He has played only four matches and has already scored two goals. Are they expecting Mbappé to score in every match? If yes, I don't think it works that way.
In fact, before fans start worrying about him, they should at least observe his performance until mid-season before they start complaining. I know that, as a great player like Mbappé, people's expectations are high, but let's just remember the season has only just started. I believe he will do much better at Real Madrid.
Obviously it's the matter of time. Killyan Mbappe is one of the greatest player and his abilities of scoring goal is outstanding. There is no doubt that even when a new player moves to a team, some time is required for him to understand the team. So Killian Mbappe also needs time to understand Real Madrid because he is playing from an easy league to a hard league despite the team having also changed. So due to these reasons people are seeing Killyan Mbappe performance wise a bit weak, although the reality is not like that. Killyan Mbappe is still performing well 2 goals in 4 matches is quite good.
No need to worry about this, Killian Mbappe is a super strong player, he knows how to serve in every environment. Very soon he will understand the tactics of Real Madrid and start scoring goals just like Cristiano Ronaldo. I would like to mention one thing that a player like Cristiano Ronald when Real Madrid was switched, he also faced this difficult situation, although he is the GOAT. So of course La Liga is a hard league.