You can add keyboards for writing or using next to a keyboard to a new place in the list, then tap Done.
If you add a keyboard for a different language, the corresponding language is automatically added to the Preferred Language Order list. You can view this list and add languages to it directly in Settings > General > Language & Region. You can also reorder the list to change how apps and websites display text.
On the onscreen keyboard: Touch and hold to switch from one keyboard to another. Continue tapping to access other enabled keyboards.
On an external keyboard: Press and hold Control, then press the Space bar to cycle between English, emoji, and Add emoji, Memoji, and stickers with the iPad keyboard