Anyone tried this one? The X manual refers to overriding the low opening height in a specific location on the Touchscreen:
If Model X detects a low ceiling, it opens the trunk (and falcon wing doors) to a lower height, even if no obstacle is detected. If you override this height on the touchscreen, Model X remembers your choice from your location.
The next time you open the falcon wing doors in this location, Model X opens them to the height you saved.
The manual also of course has the manually open, and hold the button until you hear the chime override example (I've done this myself on a demo car); however this sounds like it's an override lower, not higher:
Adjusting the Opening Height
You can adjust the opening height of the powered liftgate to make it easier to reach:
1. Open the liftgate, then manually lower it to the desired opening height.
2. Press and hold the button on the underside of the liftgate for two seconds
until you hear a confirmation chime.
3. Confirm that you have set it to the desired height by closing the liftgate, then reopening it.