We have grouped all the DEFINES you can change together in the config.h file.
C:\Users\ < USERNAME > \Documents\Arduino\libraries\ESP-Library-develop\src\config.h
/**
------ ------ ------ ------ DEFINES for library ------ ------ ------ ------ ------
*/
#include "serialFeedback_EN.h" // language file for serial feedback
#define DEBUG_LVL 2 // Debug level: 0 - 3 | none - max
#define SERIAL_SPEED 115200
#define BOOTSTATISTICS true
...
In the following pages we take a look at all the individual DEFINES.