WholeCellGroupOpener

is an option for cells that controls whether clicking the cell toggles the cell group state.

Details

With WholeCellGroupOpenerTrue set on a cell that leads a cell group, clicking anywhere on the cell will cause the group to toggle between open and closed.

Place an opener icon on the first cell of a group:

Wolfram Language code:

CreateDocument[CellGroup[Flatten[{TextCell["section", "Section", WholeCellGroupOpener -> True], Table[ExpressionCell[n, "Output"], {n, 4}]}]]]

Clicking anywhere in the cell or cell bracket toggles the group between open and closed:

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