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 Creating a countdown for two dates in Excel October 5, 2016 Common Formula Mistakes in Excel September 29, 2016 Revolutionary Learning Experiences: Excel Automation February 10, 2019