If you go into the menu to the "Find Channels" screen, then enter an active physical channel number, say 14 for WUTV (29), it will then show the main and sub channel below. It's a powerful tool to determine what each physical channel number has for virtual channels. Except for CIII (ch. 41) all of yours only have a main channel, so it wouldn't mean much, but not so here, especially on CATV systems.
Have you completely read the owners manual with all the updates? You need to download the manual and the three separate updates to have the entire set of instructions. I believe what you get with the unit is only a quick start guide.