If Excel is not highlighting cells in the formula, enable 'Allow editing directly in cells' and 'Enable fill handle and cell drag-and-drop' in Excel options.

Want to highlight Cell or Row if a checkbox is selected? We show you hHow to highlight a Cell or Row with a Checkbox in Excel.

The easiest way I know is to apply a conditional format. In a nutshell, a conditional format changes the appearance of cells or values based on true/false conditions that you specify.

The default active cell format in Microsoft Excel isn't all that easy to see, but you can use this easy-to-implement code solution to change that.