I can't make the gnome screensaver work.

In "Setting" and "Power", the blank screen is on after 10 minutes; in "Tweaks" and "Power", "When Laptop Lid is Closed" is in bold, but not option is given, although "Don't suspend on lid close" is on.

I couldn't find any screensaver and "gnome-screensaver" is not available for Leap 42.1

Is there a way to activate the screensaver or leave a blank screen after 10 minutes of inactivity?

Thanks!