When you choose to hide worksheets in a workbook, Excel allows you to hide multiple sheets with one action: all you need to do is select the sheets before actually doing the hiding. Unhiding worksheets is a different story, however. Excel only allows you to unhide one at a time. If you have many worksheets you want to unhide, this can be very tedious.

The only way around this is to use a macro to unhide the worksheets. The following VBA macro will unhide all the worksheets in the current workbook:

Sub UnhideAllSheets()
    Dim wsSheet As Worksheet

    For Each wsSheet In ActiveWorkbook.Worksheets
        wsSheet.Visible = xlSheetVisible
    Next wsSheet
End Sub

If you would rather not unhide all the worksheets at once, you can cause the macro to ask about each hidden worksheet and then unhide each that you agree to unhide. The following macro will handle this task:

Sub UnhideSomeSheets()
    Dim sSheetName As String
    Dim sMessage As String
    Dim Msgres As VbMsgBoxResult

    For Each wsSheet In ActiveWorkbook.Worksheets
        If wsSheet.Visible = xlSheetHidden Then
            sSheetName = wsSheet.Name
            sMessage = "Unhide the following sheet?" _
              & vbNewLine & sSheetName
            Msgres = MsgBox(sMessage, vbYesNo)
            If Msgres = vbYes Then wsSheet.Visible = xlSheetVisible
        End If
    Next wsSheet
End Sub