If Thea for Rhino is not set as the Current Render, then Thea specific properties for lights, like Visibility, will not be available. [Image 1]
You will also see a different dialog everytime you create a new Thea Material. [Image 2]
To set Thea for Rhino as the Current Renderer, go to Render > Current Renderer > Thea for Rhino.
Knowledge Base for Thea for Rhino
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