Hi atholp1, when exporting using our standard export options ( not using the Export for SketchUp option) we export LayOut native information as Paper space entities and any SketchUp viewports as Model Space entities exported as 1:1 but placed in a Viewport at the defined scale.
When you double click on the drawing in Paper Space you are accessing the Model Space viewport. To go back to Paper Space you need to double click outside the viewport. You should also be able to use the tabs at the bottom of the Acad model window to toggle full screen Model and Paper Spaces (page1).