Hydra Viewport - Arnold for Katana
Viewer (Hydra) -> View -> Hydra Renderer -> Arnold
Katana to Arnold supports the Hydra (viewer).
Note:
The Hydra viewer is still currently in beta. Please report any bugs/issues that you have to encounter on GitHub.
Tip:
Enable Redraw Until Converged Viewer ((Hydra) -> View -> Hydra Renderer -> Redraw Until Converged) to ensure that viewports are redrawn until the render buffer has converged.