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Microsoft Excel: Unhide all rows and columns

Unhide all hidden rows and columns at the same time
Apply to: Microsoft Excel 2010, Microsoft Excel 2013

Select all cells on a worksheet: Press CTRL + A
On the Home tab, in the Cells group, click Format.
Under Visibility, point to Hide & Unhide, and then click Unhide Rows or Unhide Columns.

Microsoft Excel: Unhide Rows and Columns
Microsoft Excel: Unhide Rows and Columns

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