...
Select one or more environments to which you want to deploy the new API. Note that only environments that support Open Proxy Specification Deployment will be listed here (See Environment Capabilities)
...
In the final step just click “Deploy and Finish” to start the deployment , you will see which environments you have selected and you can choose which API version to deploy into these environments. Since you just created a new API with a single version, you only have one option here. Click “Deploy and Finish“ to start deploying the API and finish the API creation process.
...