Tempo List overview
When Show Advanced Tools is selected in the Advanced preferences pane, you can view and edit tempo changes in the Tempo List. You can open the Tempo List in the main window, or as a separate window.
Open the Tempo List in the main window
Click the List Editors button in the control bar, then click Tempo.
Open the Tempo List as a separate window
Drag the Tempo List out from the main window.