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 Documentation / Mathematica / Other Information / Menu Commands / Cell Menu  /
Open/Close Group

▪ Open/Close Group toggles a cell group between open and closed. Closing a group collapses all cells in the group so that only the head cell is visible.
▪ You can also close or open a group of cells by double-clicking the bracket that spans a group of cells.
▪ Keyboard shortcuts: ' ; ' '