It takes time for Mbappe to become an important player at Real Madrid and I am also sure that he will slowly adapt well with his teammates.
I also believe that Mbappe will be able to adapt to Real Madrid and will become one of the best strikers in the world. Right now I see that Vini and Mbappe still don't have a good bond. That's normal because both players are important players for Real Madrid right now. Both still have their own egos. It will take time but I don't think it will be long. Vini had a difficult time when he first played at Real Madrid and Mbappe will feel the same way.