Thanks for your feedback.
algent
I think we misunderstood each other and I probably didn't express myself well.
I wasn't talking about the login screen, but the lock screen: when you click on the User Indicator button, then on Lock to lock the user session, the wallpaper appearing to unlock it may be different from the one used back on your session or from the one on the login screen.
And it seemed to me that you could change this before in gnome-tweaks.
pomon
It is indeed OK to do this, thank you.
But so, the session lock screen change applies to all users of the computer.
Now, it seemed to me that previously with gnome-tweaks, each user could customize their own lock screen (I don't think I dreamed it).
