I was watching a video lecture from iTunes U., where instructor showed how one can take a debugger section of the Xcode and was able to pull that window away from the main.<
Xcode 11
Change behaviour
Xcode -> Preferences... -> Behaviors -> Running -> Starts -> Show tab named in active window
After that tab will be opened automatically
To create a new tab manually:
File -> New -> Tab
Window -> Rename Tab... ->