Private Sub Workbook_SheetActivate(ByVal Sh As Object)
Dim col As Long, lig As Long, plage As Range
ActiveWindow.DisplayHeadings = False
For lig = 4 To Sh.UsedRange.Rows.Count
For col = 2 To Sh.UsedRange.Columns.Count
Set plage = Sh.Cells(lig, col)
ActiveWindow.Zoom = 90
Next col
Next lig
End Sub