First things first. Let’s present the navigator shortcuts. The Workspace Window has the following for areas:
XCode 4 workspace window. © Apple – official documentation.
Opened with all areas active:
XCode 4 Workspace Window – all areas are active and visible.
Pressing cmd + 0 hides Project Navigator (left area):
XCode 4 Workspace Window – hide Project Navigator (cmd + 0)
Pressing opt + cmd + 0 hides Utilities Area (right area):
XCode 4 Workspace Window – hide Utilities (opt + cmd + 0)
Pressing shift + cmd + Y hides Debug Area (bottom area). Always useful to have plenty of space just for coding:
XCode 4 Workspace Window – hide Debug Area (shift + cmd + Y)