Arsenal are already 3-0 ahead of Real Madrid, so Arsenal don't need to attack much in the second leg match, but it would be wise for them to play defensively against Real Madrid and prevent the attacks of the opponent's players in the midfield position. Real Madrid is a very strong team at home, so if Arsenal makes a mistake and scores more goals to secure the next round with a big margin against Real Madrid, then this will definitely be a mistake for Arsenal. As far as we understand from the outside, maybe all the staff and managers of the team understand this better from being close to the team, so I think Arsenal will finish the second leg match against Real Madrid with a good performance.
Real Madrid are stronger than you expect at home. I don't know what the outcome of the match is going to be, since the match is at Real Madrid's home ground and it is a fight for survival, so this match is not going to be easy for Arsenal at all, even though they are leading 3-0. I think this match is going to be the most exciting match of the week, which is why the stadium authorities have issued some warnings for the match, as reported in the media. If the news is true, children and the elderly will not be able to watch this match sitting on the field.
It is certain that Arsenal will try to play defensively after leading 3-0 in the first leg, and Real Madrid will play offensively because they are behind. The most difficult task for Arsenal's defenders will be to keep star attacking players like Mbappe, Vinicius and Rodrygo away from the D-box.