UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Steps to reproduce the problem:
1. Chrome is stretched to full screen (not the green button full screen) on an external monitor (powered by Thunderbolt to DisplayPort) 
2. Download something, so the download bar is open at the bottom of the Chrome UI. 
3. Unplug external monitor
4. Replug external monitor
5. Tab UI, URL bar and bookmarks disappears.

To restore UI, either close the Download bar or press the green button to make full screen, then return it to normal size

What is the expected behavior?
UI stays the same

What went wrong?
The browser UI disappeared. Screenshot demonstrates!

Did this work before? Yes 

Chrome version: 66.0.3359.139  Channel: stable
OS Version: OS X 10.11.6
Flash Version: Shockwave Flash 29.0 r0
 

Deleted: Screenshot_04_05_2018__09_16.png 127 KB

	Screenshot_04_05_2018__09_16.png 127 KB View Download