Zooming and Scrolling in the Tempo Editor
To zoom in vertically in the Tempo Editor:

Click the Tempo Editor Zoom In button (“+”).
To zoom out vertically in the Tempo Editor:

Click the Tempo Editor Zoom Out button (“–”).
Zoom In and Out buttons in the Tempo Editor
To scroll vertically in the Tempo Editor, do any of the following:

Click the Scroll Up Arrow to scroll up.

Click the Scroll Down Arrow to scroll down.

Drag the Scroll bar up or down.