2023.3 : the legacy renderView disappear once ArnoldPlugin is loaded

[visu]

Arnold plugin  loaded the legacy renderView is no more available, the shortcut open ArnoldView, and window rendering editor access as well.

[Stephen.Blair · Accepted solution]

Right. As of MtoA 5.2.0 (Aug 2022), the Arnold Render View replaces the Maya Render View for Arnold rendering.

• Arnold Render View by Default: The Maya Render View has been replaced with the Arnold Render View for Arnold Renders and IPR, except for Render Sequence (MTOA-1008)

[visu]

This answer is from Autodesk ? 

This means a renderer without its specific RenderView plugin is no longer renderable.
thats the case for Iray, not RedShift.

[Stephen.Blair]

Change the current renderer, no? Then you get the render view that's available for that other renderer.

[visu]

oh i see.

the renderView is no more a generic window but a call to the defaultRenderer from the Globals.
it means you set the renderer ( whatever the favorite in globals ) and open RenderView afterward.

you are right !  it is a design workflow change to my habit.