letters across the top has changed to number

T

tina

The letters across the top of my worksheet has changed to numbers, any idea
how I change them back to letters??
 
D

Dave O

This happens inadvertently, I think, in the course of clicking through
menus. On the menu if you'll click ~Tools ~Options, choose the General
tab and deselect the "R1C1 Reference style".
 
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