The layout of the report in a report viewer depends on its ScaleMode or ZoomMode property, depending on used viewer.
For HTML5-bases report viewers the scale mode is set through the scaleMode
property in the initialization script, as explained in the Report Viewer Initialization article
To configure the HTML5 report viewer to start in PAGE_WIDTH mode, the initialization of the viewer should have this line:
... other initialization parameters
In WinForms and WPF applications the report viewer can have its ZoomMode property set directly in the PropertyGrid or via code like this
this.reportViewer1.ZoomMode = ReportViewer.WinForms.ZoomMode.FullPage; //for WinForms viewer
this.ReportViewer1.ZoomMode = Telerik.ReportViewer.Wpf.ZoomMode.PageWidth; //for WPF viewer.
Hope this helps.
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