Do one of the following:
Choose Window > Video Timeline (or press Command-7).
Click the Show/Hide Timeline button in the timing toolbar.
Note: To collapse the entire Timing pane (Timeline, Audio Timeline, and Keyframe Editor), make sure that all three buttons in the lower-right corner of the Motion project window are dimmed.
Do one of the following:
Drag the timing toolbar (the lighter gray toolbar just above the Timing pane) up or down.
Drag the boundary (the dark line) between the Library or Inspector and the Timing pane to the left or right.
Deselect both the Library button and the Inspector button in the top-left corner of the Motion window.