Oppo
Activate a Downloaded Keyboard auf Oppo
Installing a keyboard app from the Play Store only adds it to your device storage. ColorOS still treats it as inactive until you switch it on inside the system input settings.
All input methods on your Oppo phone, including on-screen keyboards, voice input, and any third-party keyboard app, are managed from one shared menu. This is why a freshly installed keyboard does not automatically appear as an option when you tap into a text field.
Where to activate the keyboard
Go to Tap on Settings ➔ Tap on Additional settings ➔ Tap on Keyboard & input method ➔ Tap on Manage keyboards. Find the downloaded keyboard in the list and select Enable a Keyboard, then confirm with Tap on Activate.
Once enabled, the keyboard becomes available as a switchable option, but it is not automatically set as your default. To type with it, tap the keyboard icon in the notification bar or long-press the space key while typing, then pick it from the list.
If the keyboard still does not show up after activation, check whether the app itself needs a permission grant, since some third-party keyboards request storage or microphone access on first launch.
Disabling a keyboard through the same menu removes it from the switch list without uninstalling the app, which is useful if you only want to test it temporarily.