Nope. You must be thinking about Excel.
If it’s accidental, you can give your cells that have expressions in them a distinctive background color and tell your employees not to touch the cells with colored backgrounds. A little better is to place a Shape over the calculation cells’ area and set the background color to have zero opacity. This is different from No Background. Then Arrange> Lock the Shape. Now it will not be possible to click into or change the covered cells.
Alternatively, you can divide your table into two tables, one for entry and one for calculations. Then Arrange > Lock the entire calculation table.
Jerry