how can i use yarn with PnP in an already angular project?

Question

In my existing angular project, i want to use yarn package manager with PnP instead of the npm. I changed the ng config with:

ng config -g cli.packageManager yarn

but the problem is when i run the command "yarn install" in the root of the project, it always adds node_modules and it seems something is wrong, how can i fix it? angular/cli version is: 17.2.2 and yarn version is: 4.1.0