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If I understand correctly you want to hide the size grip between the thumbnails and the pdf viewer. You can refer to the following code:
PdfSizeGripElement element =
element.Visibility = Telerik.WinControls.ElementVisibility.Collapsed;
In the attachments you can find an image which demonstrates the hidden size grip.
If you want to hide the thumbnail panel, you can set the EnableThumbnail
property to false
Hope this will help you. Let me know if you have any other questions.
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