What's the difference between Alert Airspace Warning and Info Airspace Warning in the moving map configuration "Airspace Settings" menu?
The popup and outline options are in a different section (alarms and warnings)
When you goto menu->MovingMap->Airspace Settings you can assign every known airspace type to either as Informational, Alert or Ignore warning type. EV4 already has a defined default, but you can adjust to your likings.
Alert warnings are intense warnings, a fire-alarm type of sound is played.
Informational warning are just that; informational, a gentle "cabin alert" sound is played.
Ignore warning type, then for that airspace never a warning will be given.
So basically its a way to specify how "intense" the sound should be when the option "Airspace Warning Sound" is enabled