Set your Windows 11 power button to Sleep, Hibernate, Shut Down, or Do Nothing — separately for plugged in or on battery — via Settings → System → Power & battery.
Battery Saver, app battery usage, brightness, sleep vs hibernate, power mode, smart charging, and dark mode — a complete recap of every battery-saving trick in Windows 11.
Settings → System → Power & battery → Energy recommendations gives personalised tweaks — adjusting sleep timers, screen brightness, and more with one click.