Hi Eugene, I do not think you can fully disable the fall sensors as it would put the vacuum cleaner at risk, lets say if there is a flight of stairs and.. it will tumble all the way down.

Some users have previously mentioned that putting a semi-translucent duct tape has worked for them to clean carpets. You need to still let some space between the tape and the sensor for it to work, if not it would prompt you to clean the sensor. Let me know if this helps,