The work area (user interface) > Viewports > Working with viewports
  
Working with viewports
To create a viewport,
1. Click View and then, in the Window group, click the arrow next to New.
2. Do one of the following:
Click Standard to create a standard viewport.
Click Selected to create a customized viewport where you can specify the viewport's name.
3. Click OK.
To close a viewport,
Click the viewport's close button.