This idea has been merged into another idea. To comment or vote on this idea, please visit WEBFLOW-I-633 List CMS Bindings When Attempting to Delete a Collection/Item.
Right now it can be very difficult to delete a reference field in a CMS item because it is so hard to find where a reference is used in bindings. It can also be hard to remove CMS collections for the same reason. Please add in the error boxes, where these CMS items are binded so that it is easier to unbind them and edit.