How do I run plan/apply locally with app.terraform.io?

Terraform
1

I have two projects. One has

terraform {
  required_version = "~> 0.12.0"

  backend "remote" {
    hostname     = "app.terraform.io"
    organization = "MyOrg"

    workspaces {
      name = "project-a"
    }
  }
}

The other has

terraform {
  required_version = "~> 0.12.0"

  backend "remote" {
    hostname     = "app.terraform.io"
    organization = "MyOrg"

    workspaces {
      name = "project-b"
    }
  }
}

When I run terraform plan in project-a/, I get a local run. When I run terraform plan in project-b/, it says

Running apply in the remote backend. Output will stream here. Pressing Ctrl-C
will cancel the remote apply if it's still pending. If the apply started it
will stop streaming the logs, but will not stop the apply running remotely.

Preparing the remote apply...

To view this run in a browser, visit:
https://app.terraform.io/app/Everlane/product-meta/runs/run-abcdef123456

Waiting for the plan to start...

Why do the projects behave differently?

I understand some of the benefits of remote invocation. But a significant downside is that it is really slow.

How can I run terraform plan locally to test out my changes?

2

Aha! There’s an execution mode setting in https://app.terraform.io/app/MyOrg/workspaces/project-b/settings/general