Trouble with fonts, and with displaying floating point numbers in LVGL project

Official Hardware Mega GIGA Display Shield
12

@farmer_giles
"%.2f" works perfect Thanks a lot

@farmer_giles @leocavagnis
I am searching Brightness control, did you know how to control brightness?
only find this code but this is not what i want...

#include <Arduino_GigaDisplay.h>

//Create backlight object
GigaDisplayBacklight backlight;

void setup() {
  //init library
  backlight.begin();
}

int i = 0;
void loop() {
  backlight.set(i++ % 100);
  delay(100);
}