nUI6 does not (yet) have '/nui' commands/help. That will be added later.
The viewport is already built into nUI6, though the "editor" for it is part of nUI6+ which I have not yet released. You can hand edit [ Interface > AddOns > nUI6 > Layouts > DPS > skin.lua ] to customize your viewport for now. There are two view ports... one for the world view and one for the UI.
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