You can view and change the Smart Stay feature by tapping Controls in the blue menu bar at the top of the screen and then tapping Smart Screen in the settings list as shown in Figure 6.
Figure 6. The Smart Screen setting option appears on the right side of the page.
By default, the Smart Stay feature is turned on so the screen will stay on as long as the Tab 4’s front camera recognizes that you’re looking at it. You can turn this off by tapping on the checkbox to clear it, and when you do so then the screen either turns off or the Daydream screen saver turns on after a period of inactivity no matter if you’re looking at the screen or not.