Depending on your configuration, you may be able to specify the way the viewer is displayed in the interface. When this is available, the Viewer Position button is displayed.
When the Viewer Position button is clicked, these options are available: Bottom, Right, or New Window.
When the Bottom option is selected, the layout displays the document viewer horizontally along the bottom spanning the Workflow interface.
When the Right option is selected, the layout displays the document viewer vertically along the right side spanning the Workflow interface.
When the New Window option is selected, the layout displays the document viewer in a separate window from the Workflow interface.