I've accidentally changed my autofill (double clicked on the little box in the bottom right) to fill in as an equation instead? There's no easy way to convert this back to the autofill function, does anyone know?
You can press CTRL+Z to roll back, and then use copy & paste to fill cells with cell formula one by one. Or, you can set system variable @DFC = 1 to always fill with cell formula, when you drag a cell formula across many rows or double clicked on the little box in the bottom right.