>mate-screensaver doesn't have a feature to change the background of the lockscreen. In 2017 a patch was added that makes it so that the background matches your desktop background,[1] but the change was made too late to be present in Flidas. Etiona will have it. The link below includes some workarounds you might try.
Oh, ok. I'll have a look at it, thak you once agina:)
