Thanks again for all of your help with this over the last few months.
We would never have got it without you!

If you then tap on the right hand keyboard, you'll see the keyboard move over so you can use it with just your right hand.
When you want to go back to the normal keyboard, you can just tap on the white arrow to the left hand side of the keyboard or follow the above steps again to move it to the other side or back to the middle.