AllowReverseGroupClose

AllowReverseGroupClose
is an option for Cell that specifies whether a cell group can be reverse closed.

Reverse closing a cell collapses all cells in the group so that only the selected cell is visible.

With the default setting AllowReverseGroupClose->Automatic, only Input/Output cell groups can be reverse closed.

Create a notebook where the Input/Output cell group can be reverse closed:

Create a notebook where the "heading" cell group can be reverse closed around the "text" cell:

Create a notebook where the Input/Output cell group can be reverse closed:

Create a notebook where the "heading" cell group can be reverse closed around the "text" cell: