adobe-for-edge extension has large blank white space on some PDF's

[Terry258575081z42]

I'm using the adobe-for-edge extension. When I open some PDF's in Edge, almost all of the browser window is a blank white area. 

Here's a screen shot of the issue:

I've been unable to find any element that I can drag to increase the size of the controls and PDF content. This PDF is being sent to me via a link in an email. I can download the PDF using the Download option and open the resulting downloaded PDF file with no issues.
It's just very puzzling why I can't locate any options that allow me to maximize the PDF display when the PDF is opened directly from the email link.