When you power a newer iPhone off, there's a small message under the "slide to power off" switch, with the text: > iPhone Findable After Power Off Tapping it

When you power a newer iPhone off, there's a small message under the "slide to power off" switch, with the text: > iPhone Findable After Power Off Tapping it displays a dialog box with a longer message: > iPhone Remains Findable After Power Off > Find my helps you locate this iPhone when it is lost or stolen, even after power off > The location is visible in Find My on your other devices and to people in Family Sharing you share location with. > You can temporarily turn off Find My network and it will resume when this iPhone is turned on again. with buttons "OK" and "Temporarily Turn Off Finding".