From model space, you can switch to the last active paper space layout.
To switch to the last active paper space layout
ThisDrawing.ActiveSpace = acPaperSpace
ThisDrawing.MSpace = FALSE
When you are in paper space, AutoCAD displays the paper space user coordinate system (UCS) icon in the lower-left corner of the graphics area. The crosshairs indicate that the paper space layout area (not the views in the viewports) can be edited.