Dan,
Thank you for replying always.
Until Pro 2.2, I think we could specify env name when we create new one or clone from another one.
It help me identify which env has specific package that can compete with other packages like TensoFlow vs PyTorch.
Based on your comment and other resources on the internet, at this time, the solution seems to be cloning renamed env and delete old one.
Again, thank you for your help, Dan.