This is under macOS Big Sur 11.1, with zsh as the shell (and oh-my-zsh) after a new Anaconda 3 installation.
Since I do not always want to be using the conda/anaconda python distribution to be used (sometimes I want to be using MacPorts python), in the base environment I executed command:
conda config --set auto_activate_base False
How do I activate the conda base configuration in a Terminal session "on demand", now that the conda
command is no longer automatically available there?