Presence via Threshold Sensor shows only Home or Unknown, never Away

I have a simple ESP32 board with two ultrasonic sensors mounted on the ceiling of my garage. The sensors are pointed at my cars as a presence sensor for when a car is Home or Away. Since the Ultrasonic sensor returns distance I used a Threshold Sensor to determine Home and Away.

The problem is the vehicles show as Home or Unknown, but never shows Away.

I’ve read several posts and it seems obvious I have an incomplete configuration but hoping someone can explain where.

My Threshold Sensor is configured as

  • Hysteresis: Not Defined
  • Lower limit: Not Defined
  • Upper limit: 1.6
  • Show As: Presence

Here are screenshots.

Thanks in advance!