Thank you for contacting Telerik Support.
By design our RadPdfViewer
does not support double click selection of line numbers. Double click over the line number selects the first word in the row. This behavior is intentionally as we strive for similar behavior as in Microsoft Word, where double click over a line number, selects the whole text content.
I hope this information helps. Should you have further questions, I would be glad to help.
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