Multiple sheet Unhide option..
Unhiding multiple sheets is a painful task, you have to go one by one. There should be an option to unhide multiple sheets at once.
Please bring in this feature.
Here's a workaround for Office 2016 until--yeah right--Microsoft addresses the problem.
Open the VBA screen with Alt F11. In the Immediate window at the bottom of the screen, type in
For Each s In Sheets: s.Visible = True: Next
and hit Enter. I've saved this coding in a Word document so I just copy and paste whenever I need it. Hope this helps.