Deleting links between maps

I normally delete a link within one mind map by clicking the link line and then selecting delete. When there is a link between maps, there is no visible link line so I don’t know how to delete. I haven’t found any documentation showing how to do this. Thanks.

Hello, Steven2duong,
Welcome to the MarginNote Forum and thanks for the information provided.
You are expected to delete the corresponding comments of two cards.
Here is a gif to promote your understanding.