Switches from a layout tab to the Model tab.
On the Model tab, you can create drawings in model space. The Model tab automatically sets the TILEMODE system variable to 1, and you can create model viewports to display various views of your drawing. Once you've completed your drawing, you can choose a layout tab to begin designing a layout environment from which to plot.
For possible performance gains when you switch between layout tabs or between the Model tab and a layout tab, use the LAYOUTREGENCTL system variable to control how the display list is updated.
