Are you saying that your radio only shows one band? Or, are you saying that you don't know how to change from one band to another?
This is what the manual says about selecting dual band mode vs. single band mode:
Kenwoods have always had this confusion where they refer to the different "sides" of the radio as "bands". "Bands" are different segments of the radio spectrum. "Sides" are different display and operating parts of the radio. So, in the above excerpt from the manual, substitute "side" for "band". As the above image shows, you can use the [A/B] key to select different "sides". Or, you can do an [F], [A/B] to turn off one "side" of the radio or turn it back on.
As I said in my first comment, the A "side" only cycles between the 144-222-440 bands and back to 144. The A "side" is not capable of selecting the HF band. The radio can only select the HF band on the B "side" of the radio.
If things aren't working for you, maybe doing a full reset will be necessary to get the radio back to the default condition. You do a full reset by going into the menus and selecting Configuration | System | Reset (menu 999). Full Reset will take you back to square one including erasing your memories
