A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi All - I just had the same experience. And same, same, couldn't find the answer.
BUT eventually I found a completely different Excel file open, with a dialogue prompting me to save it. Once I did that save, then the row titles became editable on the other s/sheet I was interested in.
Could be just happy coincidence. But once I cleared that other dialogue, I was OK to set the rows titles.