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Android 15 might automatically lock your phone when you're not paying attention
Done looking at your smartphone? Android 15 might turn off your phone screen for you.
The strings describe that the setting "automatically turns off your screen early if you’re not using your device" when enabled. However, in the case of Android 15, the Adaptive timeout setting will aim to do the reverse — changing how your phone behaves when you are not looking at it. Though we don't know a lot about Adaptive timeout right now, we expect to get a better look at the feature as Google continues to release Android 15 preview builds.
Or read this on Android Central