Converting serverless EDGE Optimized API to Regional API

We have been defining our REST API lambdas using serverless.yml configurations but have hit resource limitations because these APIs are EDGE optimized and that has a hard limit of 120 APIs.

We would therefore like to convert the existing APIs to Regional APis which have a 600 API limit.

I wonder if this can be done and how. I see nothing in our serverless.yml files that specifies the API type as EDGE optimized or Regional.

However I just found this which indicates to make it regional with
endpointType: regional