thank you aarg for your response.
It works 
with the boards "ESP32 Dev Module" and also with the "ESP32-PICO-D4" (my dev kit is based on the ESP32 PICO D4 module)
If somebody can help to explain the difference. Thx
For information I have updated with the link below, the Arduino preferences about the ESP32
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
According to the official doc at:
https://docs.espressif.com/projects/arduino-esp32/en/latest/installing.html
regards