Sorry, but FR doesn't have such feature at this moment
Really??? I did this:
1. add an OnPreview event to the TfrxReport
2. in the event handler, put the following code
procedure TdmReport.frxReportPreview(Sender: TObject);
var
  frmPreview:TfrxPreviewForm;
begin
  frmPreview:=TfrxPreviewForm(frxReport.PreviewForm);
  frmPreview.Scaled:=true;
end;
Comments
Really??? I did this:
1. add an OnPreview event to the TfrxReport
2. in the event handler, put the following code