Hide or unhide a row/column/sheet
To hide a row/column/sheet:
Select the desired row/column/sheet to hide.
In the context menu that appears, choose Hide Row/Hide Column/Hide Sheet, respectively.
To unhide a hidden row/column/sheet:
Select the row/column that is adjacent to the hidden rows/columns. For a worksheet, you can tap on any of the sheet tabs.
From the context menu that appears, choose the unhide option. For a worksheet, you can choose the worksheets to unhide from the displayed list.