For a reason only the developers know there seem to be several barometric pressures or altimeters in this sim. Some we see, some we don’t. What you do with the altimeter calibration (Kollsman window) and the KAP140 is how it should be done if it was done correctly. But since this sim is a huge buggy mess, no need to express it more politely, we indeed have to press B everytime we want all the altimeters or barometric sources to be calibrated to the same source. In the case of this sim it’s always 1013hPa/29.92 inHG above 18000’ around the whole world and the QNH below that altitude. However as there are sources in the background that won’t be synchronized to what you dial in the AP will always be off. So as said before, press B and forget doing it the correct way.
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