To remove both the SDK and its associated toolchain version, use the top-level uninstall subcommand.
For example, the following command removes both the SDK and toolchain v2.7.0 bundles:
nrfutil sdk-manager uninstall v2.7.0
You can also remove an SDK bundle or a toolchain bundle separately using the sdk uninstall or the toolchain uninstall subcommands, respectively.
For more information, see Uninstalling only the SDK or the toolchain.