In v8.1, I use the ConfigPanel class to create a custom panel in the gateway, am having a look into v8.3 and it seems like it’s one of the things (out of many others potentially) that got removed, is there a replacement class in 8.3 for the Config Panel?
No direct replacement. New gateway requires React components. See the Web UI example in the SDK examples on github.
Has ignition published the react component library/storybook yet?