Uninstalling packages?

Hi, just browsed through the user guide on managing packages at at https://www.haskell.org/cabal/users-guide/installing-packages.html https://www.haskell.org/cabal/users-guide/installing-packages.html Managing seems to imply that you should also be able to uninstall packages with a simple command. But there seem to be no instructions for how to do this for an installed packaged. What am I missing? Is it called “deregistering”? Thanks again, P.