Steps to reproduce:

1. Create a CMakeLists.txt project build with Ninja generator (create with cmake-gui i.e.). Make sure running cmake within Qt-creator uses generator ninja and the Build Steps Make should also be ninja.
2. In Projects, Build, click Add | Clone selected and give it a name.

What do you see:

1. New build configuration with Build Steps Make: mingw32-make

What do you expect:

1. New build configuration with Build Steps Make: ninja.

When running cmake on the new build configuration, I cannot change the generator from MinGW Generator to Ninja Generator.

When running cmake on the old (ninja) build configuration, I cannot change the generator from Ninja to MinGW, but that's fine.