URGENT! How to I change the roi (fov) to 15 deg. or 4x4 array on the VL53L1X Tof Sensor on Raspberry Pi 3B?

Everywhere I look, the VL53L1X Tof Sensor says that it has a standard fov of 27 degrees (or 16x16) and can be reduced to 15 degrees (or 4x4 SPAD array). But how do I do this on the Raspberry Pi (in python)? In your VL53L1X_register_map.h there is a function called:

#define VL53L1_ROI_CONFIG__MODE_ROI_XY_SIZE 0x013F
 
/*!<
 
 type: uint8_t \n
 
 default: 0x00 \n
 
 info: \n
 
 - msb = 7
 
 - lsb = 0
 
 - i2c_size = 1
 
 groups: \n
 
 ['nvm_copy_data', 'roi_config']
 
 fields: \n
 
 - [7:0] = mode_roi_xy_size
 
*/

How do I use this or another function to make my ROI 15 degrees (4x4 SPAD) instead of 27 on the Raspberry Pi like your documentation says it can? Or do I have to hook it up to some software and do it in there to change it?