Popped out to the Yeti website to look at the 2021 manual. Yeah, not much in there. It's on Page 20. Since it's your first, I'll point out you definitely want to take the time to do the strut setup on page 16. That has the biggest impact on handling (better deep powder and hill climbing performance or better low speed handling, more front ski pressure or less, more stability or less, etc.
2021 Yeti Owner's Manual
There are more details on the shock themselves (what each setting does) in the Elka Owner's manual on the Yeti website. Generic, but does go through the shock settings.
Elka Owner's Manual
By the way, don't worry about the "Sad" emoji left above. They are usually unintentional and just from people scrolling with a phone or tablet. They are in a bad place and annoying, so a lot of accidental emojis get left, but is what it is. We live in a social media world, now, so even forums have to have "happy, sad, angry, like" feedback on every little thing. Ha.
Nice bike and setup. Besides the items you mentioned, slap an engine blanket, rear engine blanket and radiator covers on their and you should be ready to run!