Controls if you want to show a small indication on the list when an item (game & hardware) is marked with a specific label. The marker is a bar with a width or height specific by you.
Example: consider I have labels 'Rani', 'Sam' & 'Robbe' to indicate what games belongs to (or interests) which one of my kids. I want to mark those games with their label, but I don't want to see that label on the list (small). To achieve this I could apply a marker for list (small) and also uncheck the 'SHOW ON VIEW' for list (small) on the label.