The Raspberry Pi 400 can be safely turned off (and back on again) with the F10 key.
Power off by holding down the Fn+F10 keys for two seconds. This carefully shuts down your operating system, so you don’t cause any corruption to your memory card.
Powering back on is achieved by pressing F10 (or Fn+F10).
Switch Cable Option
Whilst the F10 key method uses hardly any power at all whilst in 'off' mode, we also offer a USB-C power switch cable for those of us who prefer to completely power down our electricals! Make sure you shut down with F10 first to avoid SD card corruption.