Security policy calls for screen savers to turn on after 30 minutes of inactivity. Although the user can easily avoid the screen saver turning on in the middle of a class or presentation by turning on Presentation Mode.
To turn on Presentation mode, press the Windows key+ x, then click the button Turn On just above Presentation Settings.
To adjust Presentation mode settings, in the Start search box type "presentation" to pull up adjust
Then configure as desired.