I'm on macOS Catalina [10.15]. Here is what I get when try to deactivate:
(django-learning) ~/git/stats-k8s/k8s-monitor (master) $ deactivate
DeprecationWarning: 'source deactivate' is deprecated. Use 'conda deactivate'.
(django-learning) ~/git/stats-k8s/k8s-monitor (master) $
(django-learning) ~/git/stats-k8s/k8s-monitor (master) $
(django-learning) ~/git/stats-k8s/k8s-monitor (master) $
(django-learning) ~/git/stats-k8s/k8s-monitor (master) $ conda deactivate
CommandNotFoundError: Your shell has not been properly configured to use 'conda deactivate'.
To initialize your shell, run
...
IMPORTANT: You may need to close and restart your shell after running 'conda init'.
(django-learning) ~/git/stats-k8s/k8s-monitor (master) $
I already looked at question: How to leave/exit/deactivate a Python virtualenv but did not help.