how to correctly change rke2 helmchart manifest on a HA cluster. I means a have 3 master/server node, and if I want to change some settings for rke2 default integrated ingress-nginx. How should I shutdown some master nodes and modify the helmchartconfig yaml files in what kind of the order? thanks

Never done it, but I seem to recall someone asking if those needed to go on all master nodes or just one was fine and a Rancher person said one was fine. So for your change there's a decent chance you can just toss it in one master (or all 3 at once if you want) and wait a while. Never done it, just repeating what I think I've seen here before.