How can I create a secure private network?

This is the first time I use Linode.

I'm using AWS and GCP for a long time. I want to create a VPC as AWS or GCP.

As I know, all instances are isolated per cuatomer account in AWS/GCP. But when I create an instance in Linode, it can ping other instances of other customers.

So How can I create an isolated VPC network as AWS/GCP?

Thanks for your help!