Zorin Core 16 : Prevent the screen saver while watching a movie with VLC

[zabadabadoo]

Or you can fool it by running Caffeine. Which simulates mouse movement thereby screensaver never triggers when it is running.
Ref:

Remove blank screen after inactivity

Not sure if you are using a laptop or not. But if you are, check Settings>Power that blank screen is not set 15min (as mine is). [blanksc] I’m not a user of Caffeine on my Linux rig, but have used it successfully on a work PC under Windows, to keep display alive during presentations etc. Long story, but corporate IT Admin installed Caffeine rather than change power settings for one staff member. I assume this Caffeine app is the same thing for Linux, which simulates small mouse movement to fo…

That refers to Z15 but should still be available and work on Z16.