Thanks for the reply.
Following your advice, I used a black background for the desktop. I also realized that it’s possible to remove the trash bin icon, then put the background of the taskbar in black, reduce its size, use auto-hide and even delete all its component one by one (by right clicking on the taskbar).
I also found the way to hide all the boot screens :
Rainbow screen :
- add disable_splash=1 at the end of the line in the file /boot/config.txt
4 raspberries logo :
- add logo.nologo at the end of the line in the file /boot/cmdline.txt
texts :
- in file /boot/cmdline.txt, add quiet at the end of the line and change console=tty from 1 to 3
cursor :
- add vt.global_cursor_default=0 at the end of the line in the file /boot/cmdline.txt
Now when the raspberry boots up, The screen remains fully black until MM starts and all the modules are loaded, except one white flashing screen at the startup of MM, I don’t know why.
Also, from turning on the raspberry until full loading of the MM and modules, it takes 49-50s. Is this normal?
About your comment on the power consumption, mine will be installed in the bathroom, so I intend to turn it on when I switch the light on, as per local electrical regulations, there can’t be no power inside a bathroom when it’s not switched on in purpose.