At this step, you select the project in which you need to run a stack, the region in which the stack should be run, and the scope of stacks to be seen in the list: My Templates - you will see only the stacks created by you and the Run stack Only Maestro Stack - you will see only Maestro Stacks and the Run stack Only Cloud Formation - you will see only AWS CloudFormation stacks. Only Terraform - you will see only Terraform stacks.
For more details on Maestro Stacks, please see our Cloud Formation Service Guide For more information about AWS CloudFormation, see AWS Utilization Guide, section 6.1. AWS CloudFormation Template Introduction. For more details about Terraform, please see the Services Guide, Terraform as a Service section.