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

1_Screenshot_set_the_default_height_and_width_of_the_embedded_PDF.png

  1. Go to Settings -> Knowledge base site -> Custom CSS & JavaScript, and Custom CSS tab is the default section

  2. Paste the below CSS snippet in the window

object {
height: 600px !important;
width: 900px !important;
}

  1. Update the desired height and weight as per your requirement

  2. Click Save

Outcome

2_Screenshot-outcome_set_of_height_&_width.png