The Signature List shows all the time and key signature changes in your project, as well as any score symbols in the project score. You can create, copy, move, and delete time and key signature events in the Signature List.
Create button: Click to create a new signature event.
Signature List area: Displays all time and key signature changes, and their position in a project.
Signature Set pop-up menu: Choose the signature set to view and edit.
Do one of the following:
Click the List Editors button 
in the control bar, then click Signature.
Choose View > Show List Editors, then click Signature.
For more information, see Time and key signatures overview.