I watched Arsenal's matches in EL and in the Premier League, and I will say that Arteta did not spend much energy on EL, either he thought that this was enough for opponents of this level, or this tournament was not very important for him.
After seeing the performance achievements of his players this season, I think Mikel Arteta will continue to use the same game in the Europa League against his opponents later and maybe it is true that he will not be serious for the Europa League this season because they have a more real target, namely winning the EPL title this season. But if Arsenal can also win the Europa League this season, of course it is an extraordinary achievement.