How to Stop Xcode from Rand-Tabbing Windows

For some reason, relaunching a project randomly puts my windows into tabs into another window. This is a new misbehavoir in Xcode 9b that continues to Xcode 9b6 although happens less frequently than b4.


This has been going on for some time and yes I did radar it... Is there any way to turn tabs off completely?


With some of my larger projects, it is getting very disorienting. I have a dozen windows opened to specific files in specific locations on my various screens. Closing and re-opening the project scrambles the entire workspace.