the right side should work for you.
holding an iphone in your right hand does not make every key equally easy to reach. on a larger phone, the left edge of a full-width keyboard is often where your grip has to do extra work.
a right-positioned keyboard brings the active typing area in toward the thumb already holding the phone.
try apple’s right layout.
iphone includes a right-handed keyboard layout. touch and hold the emoji or globe key while typing, then choose the right layout. it is a useful built-in option for shorter replies with one hand.
tap the open edge when you want to return apple’s keyboard to the centre.
keep position flexible.
una mano gives you a right position, a centre position, and a left position from within the keyboard. that is useful when your right hand is free now, but the rest of your day does not stay that tidy.
the letters remain where you expect them. only the distance to them changes.