The user API that is documented is the file vl53lx_api.c. The files in the vl53lx_api_core.c file were really not meant to be called by the user.
Neither of those parameters are going to help you get the best single target.
MAX_RANGE_RESULTS
if you ask for 2 targets you will get a distance to an object and the distance to the wall behind the target.
if you ask for only 1 target, you can get either the strongest signal or the closest. It depends on what you want.
MAX_USER_ZONES
Each range you get the opportunity to change the region of interest. By taking a sub-sample of the full SPAD photon detection array, you and perhaps find more information. But this only makes sense if you use the VL53L1CD as it has a lens over the receive side of the sensor. That code is a remnant of the prior sensor.
The VL53LX is a VL53L1CB with the lens removed. Turns out that lens is pretty costly.
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