This window displays a specific context view depending on the selected node.

For example, the context view for an object is the scene view, the context view for an output driver is the render scheduler, the context view for a shader is the shader view etc.

You can access this view by clicking the new tab icon in the network editor and selecting New Pane Tab Type ▸ Context View. You can also change an existing pane to a context view pane by clicking on an existing pane and selecting Context View.