To use the vision mode and the detection mode together for maximum effect you can do the following
1) Set the vision mode to "Infravision"
2) Add a "See Heat" or "Sense Heat" detection mode (probably best to keep the ranges the same between vision and detection)
3) Add "Basic Sight" after the Heat detection mode, set range to 0 and uncheck the checkbox to also disable it. This is a temporary workaround
As FloRad explained: