In previous versions, the Reset button reverted the parameter's value to the last submitted value. The parameter's default value was unrecoverable. In v19.2, we have modified this behavior. The Reset button now restores the parameter's default value.
Before

v19.2

You can temporarily return the previous behavior. Set the DevExpress.XtraPrinting.Native.PrintingSettings.ParameterPanelResetMode option to RestorePreviousValue.
[C#]
static class Program {
static void Main() {
DevExpress.XtraPrinting.Native.PrintingSettings.ParameterPanelResetMode =
DevExpress.XtraPrinting.Native.ParameterPanelResetMode.RestorePreviousValue;
}
}
[VB.NET]
Friend NotInheritable Class Program
Private Sub New()
End Sub
Shared Sub Main()
DevExpress.XtraPrinting.Native.PrintingSettings.ParameterPanelResetMode =
DevExpress.XtraPrinting.Native.ParameterPanelResetMode.RestorePreviousValue
End Sub
End Class