When you miss an attack as an Arcane Archer fighter, the Curving Shot feature (XGtE, p. 28) lets you use a bonus action to reroll that attack against another creature within 60ft of the first.
At 7th level, you learn how to direct an errant arrow toward a new target. When you make an attack roll with a magic arrow and miss, you can use a bonus action to reroll the attack roll against a different target within 60 feet of the original target.
Would you need to be able to see the second target when rerolling this attack?
I imagine that if you know the second target is there it would be similar to attacking an invisible target, and thus be with disadvantage.
Would it be possible to hit a second target if you didn't know they were there?