To select the first hidden row or column on the worksheet, do one of the following:
In the Name Box next to the formula bar, type A1, and then press ENTER.
On the Home tab, in the Editing group, click Find & Select, and then click Go To. In the Reference box, type A1, and then click OK.
On the Home tab, in the Cells group, click Format.
Do one of the following:
Under Visibility, click Hide & Unhide, and then click Unhide Rows or Unhide Columns.
Under Cell Size, click Row Height or Column Width, and then in the Row Height or Column Width box, type the value that you want to use for the row height or column width.
I hope this is helpful!