I had the same issue and was hoping there would be an answer here. I finally found the following which directly answers your question. Thanks for asking!
Specifically, do the following:
Installing a different version of Python. Create the new environment:
To create the new environment for Python 3.6, in your terminal window or an Anaconda Prompt, run:
conda create -n py36 python=3.6 anaconda
You need not go any further. From this point forward, every time you create a new environment, you will see: