How to stop Windows 11 from turning off your screen
To stop Windows 11 from turning off your screen, right-click Start > Power Options > Screen, sleep, & hibernate timeouts and set the screen timeout to Never.
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Windows 11 screen timeout settings
- Right-click the Start button (Windows logo) on the taskbar.
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Click Power Options.

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Click Screen, sleep, & hibernate timeouts.

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Select Never for each option.

- Close Settings.
Can't find Power Options? Open Settings > System > Power & battery.
Your screen will stay on until you turn it off.
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Related:
How to keep laptop running with lid closed in Windows 10 & 11
How to disable the power button in Windows 10 and 11