or Constraints Editor icon 
to toggle between
the Timing Constraints View and Timing Analysis View.The SmartTime main window is composed of two main views:
SmartTime Constraints Editor View that enables you to view and edit timing constraints in your design.
SmartTime Timing Analyzer View that enables you to analyze your design. You can also apply timing constraints in the design using Timing Analyzer.
You can navigate between the SmartTime Constraints Editor and SmartTime Timing Analyzer by choosing Tools > Constraints Editor > Scenario or Tools > Timing Analyzer > Maximum Delay Analysis or Minimum Delay Analysis.
Tip: Alternatively, you can use the Timing Analyzer icon or Constraints Editor icon to toggle between
the Timing Constraints View and Timing Analysis View.