manual qnh input

The latest version has foreseen a manual QNH input to benefit of the AMSL <==> FL conversion, even without pressure sensor.
Unfortunately, I was not able to use it.
Here below the error message when I make a long press on the FL button/display.
I checked the options several time, but could not find the option mentioned in the error message, probably because I do not have a pressure sensor.

Unfortunately, I was not able to use it.
Here below the error message when I make a long press on the FL button/display.
I checked the options several time, but could not find the option mentioned in the error message, probably because I do not have a pressure sensor.
