Using python 3.6 in new Anaconda Environment

I am creating a new anaconda environment(my first) in Anaconda Navigator. The libraries I intend to use require python 3.6 but from the python packages drop-down list(see screenshot below) I’m only seeing python 3.8. How can I install python 3.6 to anaconda so that it appears in the drop-down list?

Answer

To create an environment from the start

conda create --name my_env python=3.6.5

To install pyhton in an existing environment

conda install python=3.6.5