How delete only one relationship with GraphQL Library


I try to find the graphQl mutation for delete only one relationship between two nodes.
I found the doc for nodes but not for relations :

I defined relations in schema with interfaces like this example :

 interface RelTook @relationshipProperties {
        _id: ID! @id
        createdAt: DateTime! @timestamp(operations: [CREATE])

And finally I don't get it in schema explorer for writing the "delete" mutation.

Thanks for your help !