Xiaomi
Turn a Keyboard On or Off auf Xiaomi
MIUI keeps every installed keyboard disabled by default, even after a successful download from the Play Store. Android treats each keyboard as a separate input method that has to be granted permission before it can appear in the switcher or become the default typing option.
This behavior protects your data, since an enabled keyboard can technically read what you type. It also explains why a freshly installed app is not enough on its own: the system still needs your explicit confirmation.
Where to turn a keyboard on or off
Go to Tap on Settings ➔ Tap on Additional settings ➔ Tap on Languages & input ➔ Tap on Manage keyboards. Here every installed keyboard is listed with a toggle.
Switch the toggle to activate or deactivate the keyboard you need, then confirm the security prompt with Tap on OK. Once enabled, the keyboard becomes selectable in the language switcher while typing.
If you only want to remove a keyboard from the switcher without uninstalling the app, disabling it here is enough. To fully replace Gboard as your default, you still need to select the new keyboard separately after enabling it.