Android 12 has an iPhone-style one-handed mode
(Android Police)

But you can't use it yet Phones just keep getting bigger, and there`s no sign things will change anytime soon. As such, one-handed modes are a common add-on from Samsung, Motorola, and other OEMs, but Google hasn`t implemented its own version until now. Android 12 has a one-handed mode as rumored, and it`s reportedly fully functional. However, it`s not exposed in the settings in the first preview build. XDA`s Mishaal Rahman got the feature working in the dev preview. Read More Android 12 has an iPhone-style one-handed mode was written by the awesome team at Android Police.