Printing "Reader View" email on MacBook Air

Printing "Reader View" email on MacBook Air

In Reader View, clicking on the print icon leads to a blank page with just a ZOHO logo and a lock icon at the top.  

If I save the reader view to PDF to print from there, it only saves the portion directly on the screen, and not the entire email that I can scroll down to see while in Reader View. 

If I try to print the email without the reader view, it also only prints the section seen on the screen.  

How can I get a clear copy of the email printed from Reader View in MacBook Air?   It's necessary for a court case.