Deletable

is an option for Cell that specifies whether the cell can be deleted interactively using the front end.

Details

With the setting Deletable->False at the notebook level, you can prevent any cells in any notebook from being deleted.

Examples

Create a cell that cannot be deleted:

Wolfram Language code: CellPrint[TextCell["text", "Text", Deletable -> False]]

Create an inline cell that can be neither edited nor deleted:

Wolfram Language code: CellPrint[TextCell[Row[{"the expression ", ExpressionCell[Sqrt[x], Deletable -> False, Editable -> False]}], "Text"]]

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