[Qt-creator] How to get External debug window

[qt.dantec at free.fr]

Back to C++ and Qt, used in the past to have both an external doc
window and an external debug window.

I did find easily how to setup the external doc window, but cannot
find the option to have an external debug window.

It should be located either in the options/environment tab or the
options/debug tab, but it is not and I cannot find it anywhere else.

Please advise.

(QtCreator 4.6.2 using dark mode)