Question about POI indicators (cities)

Hi

I would love to use the POI indicators for identifying the cities during my VFR flights. I’ve tried to use them but I have some questions:

Is there a shortcut to toggle these indicators? The only way I’ve found is using the assistant menu.

I don’t understand how they work. During the flight I can see a ton of them, but I don’t know how I can display the name of a particular city. I’ve seen there is a shortcut: NEXT POI, but it seems it doesn’t work, I press the keys but it didn’t change. Is there a way for change the active POI?

Regards.