P3Dv5.3HF2 but this probably applies to all sims.
I’m approaching MMMX - Mexico City airport, altitude 7,300ft above sea level. I open the GSX menu at 9,000ft AGL but all I see is the option to display the Map. No nearby airports are shown.
Eventually at 9,000ft ASL it appears but my ground altitude is only 1300ft. I’m a little busy flying the approach.

Could an adjustment be made please Umberto to cater for high altitude airports?