Select the entire worksheet (Ctrl-A). Then, from the Format Menu, choose
"Columns", then "Unhide".

If the Unhide option is greyed-out, then make sure the sheet is not
Protected. (Tools--Protection--Unprotect Sheet)

HTH,
Elkar


"Karin" wrote:

Hi, I have a sheet that all columns to the right of N are not visible, it's
just gray (no column letters either). I can't unhide anything. How was this
done and how do I undo it?