The ActiveShade button, available from the, creates an rendering in a floating window.
ActiveShade gives you a preview rendering that can help you see the effects of changing lighting or materials in your scene. When you adjust lights or materials, the ActiveShade window interactively updates the rendering.
To create an ActiveShade rendering in its own window, choose the ActiveShade command from the Render flyout on the main toolbar.
Creates anthat is "docked" in a viewport.
When you right-click an ActiveShade window, the lower-left quadrant of the quad menu displays a set of commands for.