Re: LCD X and Y position

Look for the function lcd_implementation_status_screen() which you find either in dogm_lcd_implementation.h for graphic controllers:

  lcd_print('X');
  u8g.drawPixel(8,XYZ_BASELINE - 5);
  u8g.drawPixel(8,XYZ_BASELINE - 3);
  u8g.setPrintPos(10,XYZ_BASELINE);
  lcd_print(ftostr31ns(current_position[X_AXIS]));
  u8g.setPrintPos(43,XYZ_BASELINE);
  lcd_print('Y');
  u8g.drawPixel(49,XYZ_BASELINE - 5);
  u8g.drawPixel(49,XYZ_BASELINE - 3);
  u8g.setPrintPos(51,XYZ_BASELINE);
  lcd_print(ftostr31ns(current_position[Y_AXIS]));
  u8g.setPrintPos(83,XYZ_BASELINE);

or ultralcd_implementation_hitachi_HD44780.h for character based controllers:

        lcd.setCursor(0,1);
        lcd.print('X');
        lcd.print(ftostr3(current_position[X_AXIS]));
        lcd_printPGM(PSTR("  Y"));
        lcd.print(ftostr3(current_position[Y_AXIS]));

Note that I'm not using the newest version of Marlin, but probably that should not have changed too much...