Unhide Columns in Excel Post author:Author Post published:October 5, 2016 Post category:Excel Tips Unhide all hidden columns in an Excel spreadsheet by selecting the entire spreadsheet and selecting Unhide. . For more ways to make Excel work for you, take a training course from AdvantEdge Training & Consulting! You Might Also Like Excel: Creating 3D references October 5, 2016 Excel Compound Interest October 3, 2016 Excel Printing Guide October 5, 2016