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"It is possible to render inside the Maya viewport, by switching the viewport "Renderer" to Arnold. Some of the Arnold RenderView options are exposed, like Region Rendering, Debug Shading, Isolate Selected, AOVs, etc... This feature is only available with Maya 2018."
How do I make Arnold appear as follows? I use Autodesk Maya student version 2018 with the Arnold that came default with it. Currently, I only see Viewport 2.0
Have you tried installing a newer plugin version?