How do I change column identifiers from numbers to letters?

[DHoward1185]

My excel columns somehow reverted to numbers instead of letters. How can I
change the format back to letters?

[hideki]

Go to Tools -> Options... -> General tab
Unselect the setting that contains R1C1... Normally at the upper left. (Sorry I couldn't found the exact word because I'm using non-English version)

[swatsp0p]

Hideki is correct. On the General Tab, under "Settings" uncheck the "R1C1 Reference style" box.

[Dave Peterson]

Tools|Options|General Tab|uncheck R1C1 reference style.

DHoward1185 wrote:
>
> My excel columns somehow reverted to numbers instead of letters. How can I
> change the format back to letters?

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Dave Peterson