You can remove multiple people tag by clicking on people icon below the image on bottom right hand side of images. In case you are not seeing these people icon, go to View menu and switch on details(View->Details). In this was people tag would show up. Then you select the images , right click on people icon and then remove people tag.
I had the View-Details turned on, but the photos were so zoomed out it only showed a generic tag icon so I couldn't figure out your reply at first. But once I zoomed in enough to show the individual tag types, including the people tag, it made sense. Thanks.