Hi @bugsounet and @lxne,
Just to let you know i fixed my issue by doing these commands.
sudo apt-get remove --purge alsa-base pulseaudio
sudo apt-get install alsa-base pulseaudio
from this website:
https://raspberrypi.stackexchange.com/questions/122579/after-fresh-install-of-raspberry-os-the-menu-bar-is-missing-in-tightvnc-session
Thanks for your help