Hiding or Showing Child Cells
 
Click a cell’s triangle to hide or show its children.
 
A cell with hidden children has a right-pointing triangle .

A cell is “collapsed” if its children are hidden, and “expanded” if they’re visible.

You can also expand and collapse cells using commands in the View menu.
 
 
Tips

Option-Right Arrow expands the currently-selected cell and selects its first child.  Option-Left Arrow collapses the currently-selected cell’s parent and selects the parent.
 
Option-click a triangle to expand a cell and all of its descendants.
 
 

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