How do I remove unwanted contacts from the schematic which cannot be manually hidden/deleted?

During component assignment, you may have found some free contacts on the side of the schematics, that are unable to be deleted or hidden.

They are actually cross references contacts, if you move them and then delete them, they will go to their original position.

Solution: You can deactivate it individually for each component in the scheme or in the library for future insertions, please see the below video (right-click and 'open image in new tab' to enlarge it).