One-handed mode is the basic necessity of smartphones, as users could need it anytime.
Starting with iOS 11, Apple also introduced one-handed typing on iPhone.
One-handed typing is a part of iOS 11s stock keyboard, but it needs to be enabled manually.

Heres how you might enable One Handed typing on your iOS 11s stock keyboard.
The process is extremely simple for the users having this version of iOS.
They require tolong press on the globe iconpresent on the stock keyboard.

This would reveal several options.
Its up to the users now to go for the most suitable option for one-handed usage or typing.
For the best option, the left-handed orientation of the keyboard is greatly convenient for single-handed typing.

Users could even opt for third-party keyboards like Swiftkey to get more options for single-handed usage and experience.
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