In the Android settings, there is a setting that is configured by default that the display turn off by itself. In this manual, it is explained how to disable this setting
\uD83D\uDCD8 Instructions
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Open the side menu and select the Cogwheel, and select the Cogwheel again to open Settings.
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Navigate to Admin - Android settings - Go to Android settings to open the Android settings
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Once in the Android settings, navigate to Advanced - Startup & shutdown - Auto shutdown
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Change the setting to Never or any other desired time