Preview size of the PDF files in the article would vary for browsers. However, you can configure the desired height and width of the PDF file.
Solution
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Go to Settings -> Knowledge base site -> Custom CSS & JavaScript, and Custom CSS tab is the default section
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Paste the below CSS snippet in the window
object {
height: 600px !important;
width: 900px !important;
}
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Update the desired height and weight as per your requirement
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Click Save