Row headings have changed from letters to numbers. How do I undo?

[Al]

My Row headings in excel have changed from letters to numbers - making the
formulas complicated to look at, to say the least.

How do I change it back?

Even new blank worksheets have the numbers on instead of the letters.

 

[Rich]

open excell

goto tools then options

in the general tab , take out the tick from the R1C1 settings box

Rich

 

[Mike H]

Try,

Tools|options|general and un-check R1C1.

Mike