In the "Linking Persons to Files" section of the help, where it talks about link face annotations, it says "If you link more than one person to a file that way, IMatch arranges the link annotations horizontally:", but the example image shows the links arranged vertically.
https://www.photools.com/help/imatch/people.htm#person_editor?dl=hid-37
Thanks. Should be vertically, of course.