You can hide the entire Inspector area to the left of the Arrange and editor windows, providing more workspace for regions, events, and other data.
Choose View > Inspector (or use the Hide/Show Inspector key command, default assignment: I).
Click the Inspector button in the Arrange toolbar.
Choose View > Inspector (or use the Hide/Show Inspector key command, default assignment: I).
If there is not enough vertical room to display all areas of the Inspector, you can click the disclosure triangles to hide the individual boxes.