Excel Cell Modes
How can the Cell Modes affect your work?
When you try to edit a Conditional Formatting formula, and you click the left or right arrows to move across formula’s text, Excel inserts unwanted cell references. Same thing happens when you try to create or edit a Defined Name formula, or a Chart series…
If you are not aware of the active Cell Mode, then working with formulas, defined names formulas or conditional formatting formulas, editing chart series can become very annoying.