I think it is the one on the left I need to adjust, as I think the one on the right is the one I adjusted the last time for the high water level setting, as I screwed it in several turns to get the level up to the correct setting, and you can see that one is screwed in further than the center one.
I just don't want to waste water trying to figure it out, and of course I just finished all of my laundry before deciding to adjust this!