I think Arsenal and Manchester City are the teams that are not affected by a lot of crowds because they played in front of a lot of fans. As a result of playing this match, they learned how to play under pressure. Even though Manchester City has the advantage, this will be a match that the better team will win.
It has a small or big influence, but it cannot be denied that playing at home makes a team have better motivation and self-confidence, whereas the visiting team will be under a little pressure.
Likewise with Arsenal, even though they are a big team, it cannot be denied that the support of Manchester City fans will make Arsenal's mentality decline a little, especially since this match is very crucial for the two teams who are competing in the race for the Premier League title this season.
I agree with you, it will have an effect even if the influence is small or big, but what is clear is that those who play at home will be more motivated to win the match because they don't want to be embarrassed in front of their own supporters. Likewise for teams that will play at the opponent's headquarters, there will definitely be mental pressure, even though it is small, it will be very valuable for the home team of course.
Arsenal will indeed prepare for that, yes they will prepare so that their mentality is very ready to accept all the pressure they will get from the Manchester City fans. Because they will also definitely realize that this is a very decisive match for them and also for Manchester City of course. In this way, Manchester City supporters will also help their favorite team to win the match with everything they can do, namely by terrorizing the opposing players on the field, either with their creativity or with other things.