Hey! I feel you. I wish you could specify the behaviour per relation view (compact view as well as the larger relation views)
For the time being, I’m assuming this is a to-many relation, this behavior (in the larger relation views) is only for the list view. So what i find myself doing a lot in these scenarios is to make a board view and set the size to “line” this basically makes it a list view, without the ablility to link, or even unlink! only create and delete.
While annoying you can’t set this per view, you are given the ability to choose this behaviour based on which view you choose.
More about linking and unlinking? Choose list, more about creating or deleting? Choose any of the others.
Related: "Link or Create" in Board and Table