Using the nRF Connect SDK 1.6.0 with the nRF Connect toolchain manager on Mac OS X the entire SDK with all the samples is installed in the /opt folder which is hidden. This makes searching for anything much more difficult than it needs to be. It would be far simpler and thus more intuitive if the installation was moved to either a folder under your home folder or better still for the installer to ask you where you would like to put it.