You can delete a workspace only if your user role is set to "Owner".
To delete a workspace, please follow these steps:
Visit your Workspaces & Collaborators page.
Locate and select the workspace you want to delete.
Scroll down to Danger Zone section.
Click Delete Workspace.
After selecting "Delete Workspace," you will need to confirm your choice by clicking "Delete" button.
NOTE
Only workspaces with no active subscription plan or no collaborators can be deleted.