Don’t fancy seeing the yellow square face tag on your photos in the Gallery, follow the steps below to turn it off.
1) View any picture on the Gallery.
2) Press Option key, and then select face tag.
3) Select Off.
This will remove the yellow square on all the photos.
If the face has been tagged with a contact name, you can get the Remove tag option by tapping the dialog box, and follow by the right arrow button.