How to change rows, columns to alpha numerical

[KPM]

The column and row labels/titles in excel are now both numerical instead of
alpha numerical. The top left hand cell reads R1C1 instead of A1. How do I
change it back?

 

[David Biddulph]

Tools/ Options/ General
Uncheck: R1C1 reference style.

 

[Mike H]

Try:-

Tools|Options|General and un-check R1C1

Mike