I hate to bump an old thread but it was that or start a new one saying the exact same thing.
Not having the group display makes me keep checking when I think I am missing traffic. instead of a quick glance, I have to push buttons (or knobs). It gets even more confusing when the 996t and xt have the groups in the display.
As you can see I never received a reply, so I guess it's not possible. I have a 346 and by default it displays the groups. Much easier to see what's going on without messing with buttons/knobs. Why the 15X isn't setup this way or switchable makes you go hmmmmmmm?
The reason the 15X does that is so that it can display the PL, DT, HP & BT icons on the bottom row. Uniden could have designed it to show the groups when POL & HP are turned off, but I doubt if that will happen. You can have the groups displayed by pressing the FUNC knob in for 3 seconds and the Group list will appear and the scanner will stay in that system, like System Hold Mode. To exit press in the FUNC knob once.