Delete a collection linked to a deleted form

Question:
How to delete a collection created by a form, for which the form has been deleted. this form hasbeen created for testing and no more usefull so deleted.

Product:
Wix collection

What are you trying to achieve:
As the form has been deleted, the collection automatically generated at form creation is still there and useless (and empty). I want to keep my application as clean as possible, so want to delete this useless collection.

Claude