- Click the Model tab in the lower-left corner of the application window. 
  
 
- If the Model and layout tabs are hidden, set the LAYOUTTAB system variable to 1. 
  
 
- If you want to access model space from within a layout viewport on a layout tab, double-click inside the layout viewport. When you are done, you can click within any other layout viewport to make it the current one, or you can double-click anywhere else in the layout to return to paper space. 
  
 
- Click either MODEL or PAPER on the status bar at the bottom of the application window.