Can anyone explain the new aim assist settings to me?

I’ve been playing a little overwatch today and I noticed my aim feels super… off? But I’m not entirely sure what’s wrong, I’m wondering if the the new aim assist settings have taken an effect, I was under the impression they would all be off by default because I didn’t want my settings changed, I’d finally found my perfect aim and now as I said it’s just off & im not hitting targets I usually know I would. I’ve tried looking up a guide for what all the different settings do but im kinda dumb and it all sounds like foreign to me lol 🤷‍♀️ if someone could dumb it down for me that would be great

TIA 💗