Cell Groups and Outlining
The Wolfram System normally organizes the cells in a notebook automatically into hierarchical groups. Double-clicking lets you show only the heading cell of a group, or only a particular cell within a group—such as a graphic or the result of a computation.
Detailed Cell Grouping Control »
Cell ▶ Grouping ▶ Group Cells — group selected cells together
Cell ▶ Grouping ▶ Ungroup Cells — ungroup selected cells
Cell ▶ Grouping ▶ Manual Grouping — switch off automatic cell grouping