Auto-created EC2 instance and how to delete(terminate) it?

I'm launching an EC2 instance in AWS. And there is an auto-created EC2 instance, named Test-env. Every time I terminated it, AWS would auto-created a new one for me. is there any way to terminate the auto-created instance and prevent it from creating a new one?

Shown in the picture above, I terminated the Test-env twice, and AWS just created a new Test-env for me.

It seems like you have been using Elastic Beanstalk. If you open up that section of the AWS Management Console, you can delete the application/environment from there. This will bring down the instance as well. When you terminate the Elastic Beanstalk instance manually through the EC2 section, the system thinks that it has failed and will launch a replacement.

Reference: https://forums.aws.amazon.com/thread.jspa?threadID=115913