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How do I keep my device Screen from going to Sleep while I'm using it?
Sleep Mode is a power-saving mode of operation in which devices or parts of devices are switched off until needed.
To adjust the screen timeout of the display, open the Notification Panel by swiping your finger from the top of the screen to the bottom, and touch Settings > Display > Sleep. Select the desired delay from 15 seconds of no activity to 30 minutes.