The JavaScript engine will indeed take ownership of the object created by Qt.createComponentObject. This is not documented specifically because in general, any object returned by a JavaScript function is normally managed by the garbage collector.

Ok, nice, these three answers (StackView / StackLayout / Loader + Component) were what I was looking for. I tried each one and I think I'll stick with the StackView and the replace method as it's easy to have a fading transition with it. And I've already found a use to improve my code for the Loader so I also thank you for that.
Thx for the help.

Hi everyone!

I've found the problem in my component. I was forgot this line in my constructor:

m_contentItem = Q_NULLPTR;

So, all works fine for now! Thanks all for the help.