The current docs (https://doc-snapshots.qt.io/qt6-dev/cmake-get-started.html) tell the user:
" 1. Set the CMAKE_PREFIX_PATH environment variable to include the Qt 6 installation prefix."
and then refer to QtCreator which will set it up right automatically...
I think it is better to provide an example which folder from a Qt installation should be used. I'm not sure if "installation prefix" is self-explainatory.
On my machine I have following folders to choose from:
Alternatively, and maybe even better, in addition, the docs mention and explain "bin/qt-cmake". Imagine someone who used qmake before and did not read a book about CMake lands on this page. IMHO, I think this is the user who this page is for. With qmake, you just call the one from a Qt installation you wanna use and the rest is done for you. qt-cmake does something similar but it is not documented