Uninstalling Keyboards - Keyman for iPhone and iPad Help
To uninstall a keyboard, follow these steps.
Access "Installed Languages"
First, open the "Settings" menu.
The "Installed Languages" menu found here manages your installed keyboards and dictionaries.
You should then see the following screen:
Removing the Keyboard
Start by selecting the language for the keyboard you wish to uninstall.
Swipe left on the keyboard you want to remove. You'll see a button to Delete.
Click the Delete button to uninstall the keyboard.