Steps to reproduce
right click on the desktop
select Hide Desktop Items (result: the items are not any more on the desktop)
reboot the computer
wait till the computer restarts
Result
there are items on the desktop
Expectation
there should be no items on the desktop
System
Lubuntu 23.10
LXQt Desktop
Alternative to hide permanently items of the desktop even after rebooting the computer:
main menu, Preferences, LXQt Settings, Desktop, Advanced:
deactivate all files
Apply, OK