KAP 140 Unable to Adjust Altitude via “Select Altitude Bug” & “Plus/Minus” Keybinds

The behavior of Plus and Minus in MSFS is different from what it was in FSX. Instead of Plus and Minus, the command in MSFS is CTRL+PLUS and CTRL+MINUS. Please use these after pressing CTRL+SHIFT+Z / CTRL+SHIFT+H, and it should work as intended.