Generally you specify the view anyway so the default has no bearing. For example, "extract data" offers Periodic / YTD / Scenario Default as three options.
Are you sure that the person telling you "Default View ..." was talking about the View dimension? Budget reports are usually (default option) presented as periodic data plus 'Total Year' and perhaps quarterly or halfyearly subtotals. Actuals are more commonly shown YTD. Where Actual and Budget are compared, it is quite common to have six columns: three for current month (i.e. periodic) Budget / Actual / Variance and another three for YTD Budget / Actual / Variance.
Your question has been here a while with no response until now. I think that may be because the question can be understood in different ways and people do not want to waste time answering the wrong interpretation.
Thank you. I mean the Default View setting of Scenario members. It control what present on <Scenario View>. I was not clear about this setting.