How can I duplicate the settings in one environment into another?
There is no option to copy existing settings and configurations in an environment and apply them to a new environment. However, depending on your technical skill and if you think this is a problem/request that you'll run into more than once you might want to look into Terraform. Since Kaleido is a cloud native platform, you can define your configurations and settings in Terraform and then use that to quickly and easily apply them across environments when needed.
Terraform makes use of Kaleido's administrative API surface, which you have the option of leveraging as well. In fact, a single API call to the /environments route is all that you need to create your environment. You could then call endpoints like /nodes and /appcreds to create actual resources and security credentials.