Development Objects may be exposed in the interface with one or more usage types. It is possible to delete an individual usage type or the whole object, if there is no deprecated usage type. Also, if the said usage type is more restrictive than the others then deleting it will result in deletion of those also.
An exposed object can only be added by specifying the object along in Exposed Objects List with the scoped usage types. The objects that are to be added to a package interface should be
You can select a usage type and click the button Delete Usage Type in toolbar to remove the usage type