settings query param was removed in https://codereview.chromium.org/2177983004 , hence our dock state was not respected. We now directly set the dock state using WebInspector.dockController.setDockSide api since it seems more reliable.
set dock state using devtools dockController
Are you able to update the dock side and have it persist across relaunches/reopens?
I'm seeing it go to the right side every time using the default app. Even after I set it to go to the bottom, then close it, it opens the next time on the right side again.