UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.146 Safari/537.36

Steps to reproduce the problem:
Using a MacBook pro with a retina display and one external HD monitor (1080p).

1. Open a responsive website in chrome (eg https://www.fastcompany.com/)
2. Open dev tools panel
3. Toggle device toolbar
4. Select a device (it seems to be doing it for all options)

What is the expected behavior?
To be able to see the full screen of the device

What went wrong?
On the external monitor I only see the top left quadrant of the screen. The page is rendered the correct size, but it's cropped.

On the Mac's build in display it works just fine.

Did this work before? Yes The previous one. Not sure of version number.

Chrome version: 65.0.3325.146  Channel: stable
OS Version: OS X 10.13.2
Flash Version:
 

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