You only need the keyboard to name your character. Hopefully it's not much of an inconvenience.
Or do you mean when you exit the game and do things in other apps? The Quest doesn't do anything which could cause that, it interacts with Android minimally (there is no 'disable keyboard for other apps' switch anyway
).
Also it seems to me that this 'Swift' keyboard is a third party app. Maybe you could try talking to them, if their app doesn't always work.