One way.
Press Ctrl G (goto) - A1
Hold Shift and press left arrow
Formatcolumnunhide.
or
Select All (ctrl A) and unhide. This will unhide all the hidden columns.
best wishes
Sreedhar

"The Hun" wrote:

I need to UN-hide column A:

I had to Hide column A, and now I can't UN-hide it. I tried the
normal way of clicking on the top of column B and moving the highlight
left to supposedly include column A, but without success.

I did this once a long time ago but can't recall how to do it. Can
anyone help?

Thanks,