UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36

Example URL:
any pdf with more than 1 page

Steps to reproduce the problem:
1. Open any pdf file
2. 
3. 

What is the expected behavior?
1. Open any pdf file
2. click on an icon for book view
3. choose if it has a title page or not

What went wrong?
this is a feature request.

Does it occur on multiple sites: Yes

Is it a problem with a plugin? Yes component:Internals>Plugins>PDF

Did this work before? No 

Does this work in other browsers? N/A

Chrome version: 71.0.3578.98  Channel: stable
OS Version: 10.0
Flash Version: 

I am a first timer here. if this is the wrong section or if i missed an issue with a similar request, please guide me into the right direction.