Thank you very much for your help and explanation. I placed the file where you mentioned in my project folder.
Unfortunately it keeps telling me for my GFX-font type:
src/main.cpp: In function ‘void loop()’:
src/main.cpp:343:18: error: ‘My_Own_Sans_5’ was not declared in this scope
tft.setFont(&My_Own_Sans_5);
despite declaring:
#include <Adafruit_GFX.h>
#include <gfxfont.h>
#include <Adafruit_ST7735.h>
#include <Adafruit_I2CDevice.h>
#include <Fonts/My_Own_Sans_5.h> // I also tried with #include <My_Own_Sans_5.h>
Obviously I did not get it all correctly. Could you maybe help on this? Many thanks.