Right click on icon in system tray and there should be a "screensaver" option or go in through "settings" and there should be a tab there.
As I have already stated, when I right click the icon in my System Tray, there is no option for Screen Saver. Please actually look at the screenshot I provided before commenting.
Are you able to set the screen saver through the Windows settings? If it's blocked there (e.g. by a company IT policy, it won't show up in DisplayFusion either).
