How is it Qt 6 when qtcreator is still version 4.14? I think I don't understand Qt's versioning.
Qt Creator is a C/C++ IDE that happens to be written in Qt, and has some extra features that make developing Qt easier, such as a GUI designer for your app's windows. But it's just an IDE, you can use it to write pure C or C++, even in a basic Makefile project, without ever touching Qt, those features appear only when you select a Qt project template. They have a whole bunch of templates.
They are separate things so there's no reason why the version numbers should be kept in sync. Qt Creator could be using an obsolete Qt 3.0 from decades ago, and it wouldn't matter, that's up to the Creator devs and would have zero effect on your experience as an end-user.
If you're a C or C++ user I recommend you try out Creator even if you have zero interest in Qt. I like how fast and responsive it is, the advantage of being written in a native language I guess.