#define ENDSTOP_Z_BACK_ON_HOME 0

#define FEATURE_FAN_CONTROL 1

#define FEATURE_AUTOLEVEL 1

#define PRINTLINE_CACHE_SIZE 50   

#define ENDSTOP_Z_BACK_ON_HOME 20

I looked in pins.h and for my motherboard #80 there is no... "#define PROBE_PIN          -1" like in some of the other motherboard descriptions.

#define Z_PROBE_START_SCRIPT "M340 P0 S680"

#define ENDSTOP_PULLUP_X_MIN true

// prusa i3 settings #define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,4000,600} // default steps per unit for prusa i3 rework #define DEFAULT_MAX_FEEDRATE {500, 500, 2, 25} // (mm/sec) #d

#define _CustomEvents_H

UI_ACTION_XY1_BACK is declared in CustomEvents.h (#define UI_ACTION_XY1_BACK     1500).

#define DRIVE_SYSTEM 1

#define Z_PROBE_Z_OFFSET 0

i uncommented #define CUSTOM_EVENTS in configuration so i think it should work without #include"CustomEvents.h"  to uiconfig.h

#define SERVO0_PIN A4 )

#define DRIVE_SYSTEM 1

#define NEW_COMMUNICATION 0

Use#define ENDSTOP_Z_BACK_ON_HOME 20

If we talk about same cooler fan use same pin for both plus add#define SHARED_COOLER 1

#define Z_PROBE_RUN_AFTER_EVERY_PROBE "M340 S1000\nG4 P0"