The undesired behavior is caused by the drop-down list with the zoom percentage. A possible approach is to set the VisibleInStrip property in the Shown event of the form. Alternatively, you can set the Visibility of the item to collapsed:
.radPdfViewerNavigator1.ZoomDropDown.Visibility = Telerik.WinControls.ElementVisibility.Collapsed;
I hope this will help. Let me know if you need further assistance.
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