How do I turn the number row on/off on Microsoft SwiftKey Keyboard for iOS?

From Microsoft SwiftKey 2.5.0 it is now possible to show a number row on the keyboard.

To turn the Microsoft SwiftKey number row on or off:

1. Open your Microsoft SwiftKey app
2. Tap 'Settings'
3. Tap 'Number row' to turn the feature on or off

Note: The number row will be off by default.