Col A gone; how renew?

HP 9. WINDOWS 10; LO 6.
Looked up in Libre Guide; entered ‘UNHIDE COL.’
RES: ‘NO ENTRY’
Now what?

Like most reading your questions, Help does not understand UNHIDE COL.

Try searching with a normal term - column or even COLUMN. There - results. Toward bottom of selections is showing -- columns.

Either select column B by clicking on the column header, then drag to the small square to the left, so the Name Box displays A1:B1048576; or in the Name Box enter A1:B1 and hit Enter. Then from the context menu on the column header select Show Columns.