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The screen timeout controls the time until the Samsung device's display goes into sleep mode. By default, the display turns off after 30 seconds of inactivity. The sleep timeout can be changed to the following options

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  Display
Step 3: Tap on  Screen timeout
Step 4: Choose an  option
  1. Tap on Settings
  2. Tap on Display
  3. Tap on Screen timeout
  4. Choose an option
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Samsung Instructions