How do I disable multishot mode?

I am running an ice sorcerer. In Season 6, I have noticed that when I am firing at a large group, my character fires his ice-shards at multiple opponents. The shards are distributed among the group. This behavior seems new to me in Season 6. I don’t remember it from before.

I also just noticed that sometimes the UI will say “multi-shot” while I am firing like this.

Googling “diablo 4 multishot” gave me articles about “governing stones” and “tuning stones” and “seneschal constructs” from the “Season of the Construct” which I largely avoided. I certainly never got or used a governing stone or a construct. I don’t see any effects applied to any of my gear that would indicate it.

So while this is an interesting feature, I have no idea how I got it. I certainly never requested it. And while I might like to play with it, I also want to be able to to disable it and concentrate my fire on one guy.

Is there a way to do this with a modifier keypress or something?