Hi Daljit,
Thanks for posting this here. Short answer - on the Action Canvas, create a block that points to the variable in question, and then in the dropdown, choose "Delete Variable".
Here's a video showing most of the common actions around variables (creating, duplicating, renaming, deleting, creating get/set versions, finding other instances of that variable) -
https://share.smartbuilder.com/public/videotutorials/Variable_Management.mp4Hope that helps!
- Nav