Hi,
The default framerate of 15 hz will limit the sensor to around 2-3 meters, lowering this to 5hz will allow you to see the full range of the sensor. As for the IR image, it's meant to help debug what the sensor sees, this isn't a normal camera with exposure/gain so the IR image will represent what the sensor actually sees, not necessarily in the most human-viewable format (Note that we often find the confidence image looks better to our eyes for demos).