So the way I have it configured is I have auto-targeting enabled in the options as this lets me avoid having to click R3 to initially target a mob. I rarely use the targeting feature explicitly, but it’s helped on a number of occasions as a sort of crutch. I may just shut that off and try to go without targeting at all since that’s primarily how I’ve actually been playing (I’ll move away from the fight and let my minions pick up the slack while I reposition and then point myself where i want to attack; auto-targeting mostly picks up what I’m after).
The controls on the Deck are being recognized as a standard gamepad to my knowledge, so that shouldn’t be the issue, but I suppose you never know.